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DTSTART;TZID=America/New_York:20200226T103000
DTEND;TZID=America/New_York:20200226T120000
DTSTAMP:20260513T121047
CREATED:20240212T081516Z
LAST-MODIFIED:20240212T081516Z
UID:10001885-1582713000-1582718400@cmsa.fas.harvard.edu
SUMMARY:02/26/2020 Quantum Matter/Quantum Field Theory Seminar
DESCRIPTION:
URL:https://cmsa.fas.harvard.edu/event/02-26-2020-quantum-matter-quantum-field-theory-seminar/
LOCATION:MA
CATEGORIES:Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20200225T173300
DTEND;TZID=America/New_York:20200225T173300
DTSTAMP:20260513T121047
CREATED:20240213T102444Z
LAST-MODIFIED:20240213T102444Z
UID:10002421-1582651980-1582651980@cmsa.fas.harvard.edu
SUMMARY:Fluid Dynamics Seminar
DESCRIPTION:Beginning immediately\, until at least April 30\, all seminars will take place virtually\, through Zoom. Links to connect can be found in the schedule below once they are created. \nIn the Spring 2019 Semester\, the Center of Mathematical Sciences and Applications will be hosting a seminar on Fluid Dynamics. The seminar will take place on Wednesdays from 3:00-4:00pm in CMSA G10. \nSpring 2020:\n\n\n\nDate\nSpeaker\nTitle/Abstract\n\n\n2/25/2020\nKeaton Burns\, MIT\nTitle: Flexible spectral simulations of low-Mach-number astrophysical fluids \nAbstract: Fluid dynamical processes are key to understanding the formation and evolution of stars and planets. While the astrophysical community has made exceptional progress in simulating highly compressible flows\, models of low-Mach-number stellar and planetary flows typically use simplified equations based on numerical techniques for incompressible fluids. In this talk\, we will discuss improved numerical models of three low-Mach-number astrophysical phenomena: tidal instabilities in binary neutron stars\, waves and convection in massive stars\, and ice-ocean interactions in icy moons. We will cover the basic physics of these systems and how ongoing additions to the open-source Dedalus Project are enabling their efficient simulation in spherical domains with spectral accuracy\, implicit timestepping\, phase-field methods\, and complex equations of state.\n\n\n3/4/2020 \nG02\n\n\n\n\n3/11/2020\n\n\n\n\n3/18/2020\n\n\n\n\n3/25/2020\n\n\n\n\n4/1/2020\n\n\n\n\n4/8/2020 G02\n\n\n\n\n4/15/2020\n\n\n\n\n4/22/2020\n\n\n\n\n4/29/2020 \nG02\n\n\n\n\n5/6/2020\n\n\n\n\n5/13/2020\n\n\n\n\n\nFall 2019:\n\n\n\nDate\nSpeaker\nTitle/Abstract\n\n\n9/18/2019\nJiawei Zhuang (Harvard)\nTitle: Simulation of 2-D turbulent advection at extreme accuracy with machine learning and differentiable programming \n Abstract: The computational cost of fluid simulations grows rapidly with grid resolution. With the recent slow-down of Moore’s Law\, it can take many decades for 10x higher resolution grids to become affordable. To break this major barrier in high-performance scientific computing\, we used a data-driven approach to learn an optimal numerical solver that can retain high-accuracy at much coarser grids. We applied this method to 2-D turbulent advection and achieved 4x effective resolution than traditional high-order flux-limited advection solvers. The machine learning component is tightly integrated with traditional finite-volume schemes and can be trained via an end-to-end differentiable programming framework. The model can achieve near-peak FLOPs on CPUs and accelerators via convolutional filters.\n\n\n9/25/2019\nYantao Yang (Peking University)\nTitle: Double diffusive convection and thermohaline staircases  \nAbstract: Double diffusive convection (DDC)\, i.e. the buoyancy-driven flow with fluid density depending on two scalar components\, is omnipresent in many natural and engineering environments. In ocean this is especially true since the seawater density is mainly determined by temperature and salinity. In upper water of both (sub-) tropical and polar oceans\, DDC causes the intriguing thermohaline staircases\, which consist of alternatively stacked convection layers and sharp interfaces with high gradients of temperature and salinity. In this talk\, we will focus on the fingering DDC usually found in (sub-)tropical ocean\, where the mean temperature and salinity decrease with depth. We numerically investigate the formation and the transport properties of finger structures and thermohaline staircases. Moreover\, we show that multiple states exit for the exactly same global condition\, and individual finger layers and finger layers within staircases exhibit very different transport behaviors.\n\n\n10/2/2019\nNo talk\n\n\n\n10/9/2019\nSamuel Rudy (MIT)\nTitle: Data-driven methods for discovery of partial differential equations and forecasting \nAbstract: A critical challenge in many modern scientific disciplines is deriving governing equations and forecasting models from data where derivation from first principals is intractable. The problem of learning dynamics from data is complicated when data is corrupted by noise\, when only partial or indirect knowledge of the state is available\, when dynamics exhibit parametric dependencies\, or when only small volumes of data are available. In this talk I will discuss several methods for constructing models of dynamical systems from data including sparse identification for partial differential equations with or without parametric dependencies and approximation of dynamical systems governing equations using neural networks. Limitations of each approach and future research directions will also be discussed.​\n\n\n10/16/2019\nNo talk\n\n\n\n10/23/2019\nKimee Moore (Harvard)\nTitle: Using magnetic fields to investigate Jupiter’s fluid interior \nAbstract: The present-day interior structure of a planet is an important reflection of the formation and subsequent thermal evolution of that planet. However\, despite decades of spacecraft missions to a variety of target bodies\, the interiors of most planets in our Solar System remain poorly constrained. In this talk\, I will discuss how actively generated planetary magnetic fields (dynamos) can provide important insights into the interior properties and evolution of fluid planets. Using Jupiter as a case study\, I will present new results from the analysis of in situ spacecraft magnetometer data from the NASA Juno Mission (currently in orbit about Jupiter). The spatial morphology of Jupiter’s magnetic field shows surprising hemispheric asymmetry\, which may be linked to the dissolution of Jupiter’s rocky core in liquid metallic hydrogen. I also report the first definitive detection of time-variation (secular variation) in a planetary dynamo beyond Earth. This time-variation can be explained by the advection of Jupiter’s magnetic field by the zonal winds\, which places a lower bound on the velocity of Jupiter’s winds at depth. These results provide an important complement to other analysis techniques\, as gravitational measurements are currently unable to uniquely distinguish between deep and shallow wind scenarios\, and between solid and dilute core scenarios. Future analysis will continue to resolve Jupiter’s interior\, providing broader insight into the physics of giant planets\, with implications for the formation of our Solar System.\n\n\n10/30/2019\nNo Talk\n\n\n\n11/6/2019\nFederico Toschi (Eindhoven University of Technology)\nTitle: Deep learning and reinforcement learning for turbulence \nAbstract: This talk tells two stories. \nChapter 1: We investigate the capability of a state-of-the-art deep neural model at learning features of turbulent velocity signals. Deep neural network (DNN) models are at the center of the present machine learning revolution. The set of complex tasks in which they over perform human capabilities and best algorithmic solutions grows at an impressive rate and includes\, but it is not limited to\, image\, video and language analysis\, automated control\, and even life science modeling. Besides\, deep learning is receiving increasing attention in connection to a vast set of problems in physics where quantitatively accurate outcomes are expected. We consider turbulent velocity signals\, spanning decades in Reynolds numbers\, which have been generated via shell models for the turbulent energy cascade. Given the multi-scale nature of the turbulent signals\, we focus on the fundamental question of whether a deep neural network (DNN) is capable of learning\, after supervised training with very high statistics\, feature extractors to address and distinguish intermittent and multi-scale signals. Can the DNN measure the Reynolds number of the signals? Which feature is the DNN learning? \nChapter 2: Thermally driven turbulent flows are common in nature and in industrial applications. The presence of a (turbulent) flow can greatly enhance the heat transfer with respect to its conductive value. It is therefore extremely important -in fundamental and applied perspective- to understand if and how it is possible to control the heat transfer in thermally driven flows. In this work\, we aim at maintaining a Rayleigh–Bénard convection (RBC) cell in its conductive state beyond the critical Rayleigh number for the onset of convection. We specifically consider controls based on local modifications of the boundary temperature (fluctuations). We take advantage of recent developments in Artificial Intelligence and Reinforcement Learning (RL) to find -automatically- efficient non-linear control strategies. We train RL agents via parallel\, GPU-based\, 2D lattice Boltzmann simulations. Trained RL agents are capable of increasing the critical Rayleigh number of a factor 3 in comparison with state-of-the-art linear control approaches. Moreover\, we observe that control agents are able to significantly reduce the convective flow also when the conductive state is unobtainable. This is achieved by finding and inducing complex flow fields.\n\n\n11/13/2019 \n  \n2:10pm \nG02\nMartin Lellep (Philipps University of Marburg\, Germany)\nTitle: Predictions of relaminarisation in turbulent shear flows using deep learning \n  \nAbstract: Given the increasing performance of deep learning algorithms in tasks such as classification during the last years and the vast amount of data that can be generated in turbulence research\, I present one application of deep learning to fluid dynamics in this talk. We train a deep learning machine learning model to classify if turbulent shear flow becomes laminar a certain amount of time steps ahead in the future. Prior to this\, we use a 2D toy example to develop an understanding how the performance of the deep learning algorithm depends on hyper parameters and how to understand the errors. The performance of both algorithms is high and therefore opens up further steps towards the interpretation of the results in future work.\n\n\n11/19/2019 \nTuesday \n3-4 pm \nPierce Hall 209\, 29 Oxford Street \nDetlef Lohse (University of Twente)\nTitle: Rayleigh vs. Marangoni Abstract: In this talk I will show several examples of an interesting and surprising competition between buoyancy and Marangoni forces. First\, I will introduce the audience to the jumping oil droplet – and its sudden death – in a density stratified liquid consisting of water in the bottom and ethanol in the top : After sinking for about a minute\, before reaching the equilibrium the droplet suddenly jumps up thanks to the Marangoni forces. This phenomenon repeats about 30-50 times\, before the droplet falls dead all the sudden. We explain this phenomenon and explore the phase space where it occurs. \nNext\, I will focus on the evaporation of multicomponent droplets\, for which the richness of phenomena keeps surprising us. I will show and explain several of such phenomena\, namely evaporation-triggered segregation thanks to either weak solutal Marangoni flow or thanks to gravitational effects. The dominance of the latter implies that sessile droplets and pending droplets show very different evaporation behavior\, even for Bond number << 1. I will also explain the full phase diagram in the Marangoni number vs Rayleigh number phase space\, and show where Rayleigh convections rolls prevail\, where Marangoni convection rolls prevail\, and where they compete. \nThe research work shown in this talks combines experiments\, numerical simulations\, and theory. It has been done by and in collaboration with Yanshen Li\, Yaxing Li\, and Christian Diddens\, and many others.\n\n\n11/20/2019\n\nTime: 3:00-3:35 pm \nSpeaker:  Haoran Liu \nTitle: Applications of Phase Field method: drop impact and multiphase turbulence  \nAbstract: Will a mosquito survive raindrop collisions? How the bubbles under a ship reduce the drag force? In nature and industry\, flows with drops and bubbles exist everywhere. To understand these flows\, one of the powerful tools is the direct numerical simulation (DNS). Among all the DNS methods\, we choose the Phase Field (PF) method and develop some models based on it to simulate the complicated flows\, such as flows with moving contact lines\, fluid-structure interaction\, ternary fluids and turbulence. In this talk\, I will firstly introduce the advantages and disadvantages of PF method. Then\, I will show its applications: drop impact on an object\, compound droplet dynamics\, water entry of an object and multiphase turbulence. \n\nTime: 3:35-4:10 pm \nSpeaker:  Steven Chong \nTitle: Confined Rayleigh-Bénard\, rotating Rayleigh-Bénard\, double diffusive convection and quasi-static magnetoconvection: A unifying view on their scalar transport enhancement  \nAbstract: For Rayleigh-Bénard under geometrical confinement\, under rotation or the double diffusive convection with the second scalar component stabilizing the convective flow\, they seem to be the three different canonical models in turbulent flow. However\, previous research coincidentally reported the scalar transport enhancement in these systems. The results are counter-intuitive because the higher efficiency of scalar transport is bought about by the slower flow. In this talk\, I will show you a fundamental and unified perspective on such the global transport behavior observed in the seemingly different systems. We further show that the same view can be applied to the quasi-static magnetoconvection\, and indeed the regime with heat transport enhancement has been found. The beauty of physics is to understand the seemingly unrelated phenomena by a simplified concept. Here we provide a simplified and generic view\, and this concept could be potentially extended to other situations where the turbulent flow is subjected to an additional stabilization.\n\n\n11/27/2019\n\n\n\n\n12/4/2019\n\n\n\n\n12/11/2019\n\n\n\n\n\n  \nSee previous seminar information here.
URL:https://cmsa.fas.harvard.edu/event/fluid-dynamics-seminar/
LOCATION:MA
CATEGORIES:Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20200225T150000
DTEND;TZID=America/New_York:20200225T160000
DTSTAMP:20260513T121047
CREATED:20240212T081000Z
LAST-MODIFIED:20240212T081000Z
UID:10001883-1582642800-1582646400@cmsa.fas.harvard.edu
SUMMARY:2/25/2020 Fluid Dynamics
DESCRIPTION:
URL:https://cmsa.fas.harvard.edu/event/2-25-2020-fluid-dynamics/
LOCATION:MA
CATEGORIES:Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20200224T120000
DTEND;TZID=America/New_York:20200224T130000
DTSTAMP:20260513T121047
CREATED:20240212T091651Z
LAST-MODIFIED:20240212T091651Z
UID:10001906-1582545600-1582549200@cmsa.fas.harvard.edu
SUMMARY:2/24/2020 Math Physics Seminar
DESCRIPTION:
URL:https://cmsa.fas.harvard.edu/event/2-24-2020-math-physics-seminar/
LOCATION:MA
CATEGORIES:Mathematical Physics Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20200221T103000
DTEND;TZID=America/New_York:20200221T113000
DTSTAMP:20260513T121047
CREATED:20240212T082037Z
LAST-MODIFIED:20240212T082037Z
UID:10001887-1582281000-1582284600@cmsa.fas.harvard.edu
SUMMARY:02/21/2020 General Relativity Seminar
DESCRIPTION:
URL:https://cmsa.fas.harvard.edu/event/02-21-2020-general-relativity-seminar/
LOCATION:MA
CATEGORIES:Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20200220T103000
DTEND;TZID=America/New_York:20200220T120000
DTSTAMP:20260513T121047
CREATED:20240212T083840Z
LAST-MODIFIED:20240212T083840Z
UID:10001892-1582194600-1582200000@cmsa.fas.harvard.edu
SUMMARY:2/20/2020 Condensed Matter Seminar
DESCRIPTION:
URL:https://cmsa.fas.harvard.edu/event/2-20-2020-condensed-matter-seminar/
LOCATION:MA
CATEGORIES:Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20200219T171500
DTEND;TZID=America/New_York:20200219T181500
DTSTAMP:20260513T121047
CREATED:20240212T082420Z
LAST-MODIFIED:20240507T203004Z
UID:10001888-1582132500-1582136100@cmsa.fas.harvard.edu
SUMMARY:Quantum Money from Lattices
DESCRIPTION:Speaker: Peter Shor (MIT)\n\nTitle: Quantum Money from Lattices\n\nAbstract: Quantum money is a cryptographic protocol for quantum computers. A quantum money protocol consists of a quantum state which can be created (by the mint) and verified (by anybody with a quantum computer who knows what the “serial number” of the money is)\, but which cannot be duplicated\, even by somebody with a copy of the quantum state who knows the verification protocol. Several previous proposals have been made for quantum money protocols. We will discuss the history of quantum money and give a protocol which cannot be broken unless lattice cryptosystems are insecure.
URL:https://cmsa.fas.harvard.edu/event/02-19-2020-colloquium/
LOCATION:CMSA\, 20 Garden Street\, Cambridge\, MA\, 02138\, United States
CATEGORIES:Colloquium
ATTACH;FMTTYPE=image/png:https://cmsa.fas.harvard.edu/media/P.ShorColloquium-1.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20200219T163000
DTEND;TZID=America/New_York:20200219T173000
DTSTAMP:20260513T121047
CREATED:20240212T081736Z
LAST-MODIFIED:20240507T202728Z
UID:10001886-1582129800-1582133400@cmsa.fas.harvard.edu
SUMMARY:The Cubical Route to Understanding Groups
DESCRIPTION:Speaker: Daniel Wise (McGill University)\n\nTitle: The Cubical Route to Understanding Groups\n\nAbstract: Cube complexes have come to play an increasingly central role within geometric group theory\, as their connection to right-angled Artin groups provides a powerful combinatorial bridge between geometry and algebra. This talk will introduce nonpositively curved cube complexes\, and then describe the developments that culminated in the resolution of the virtual Haken conjecture for 3-manifolds and simultaneously dramatically extended our understanding of many infinite groups.
URL:https://cmsa.fas.harvard.edu/event/02-21-2020-colloquium/
LOCATION:MA
CATEGORIES:Colloquium
ATTACH;FMTTYPE=image/png:https://cmsa.fas.harvard.edu/media/CMSA-Colloquium-2.26.20-1583x2048-1-1.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20200219T103000
DTEND;TZID=America/New_York:20200219T120000
DTSTAMP:20260513T121047
CREATED:20240212T083639Z
LAST-MODIFIED:20240212T083639Z
UID:10001891-1582108200-1582113600@cmsa.fas.harvard.edu
SUMMARY:2/19/2020 Quantum Matter Seminar
DESCRIPTION:
URL:https://cmsa.fas.harvard.edu/event/2-19-2020-quantum-matter-seminar/
LOCATION:MA
CATEGORIES:Quantum Matter
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20200214T103000
DTEND;TZID=America/New_York:20200214T120000
DTSTAMP:20260513T121047
CREATED:20240212T085126Z
LAST-MODIFIED:20240212T085126Z
UID:10001896-1581676200-1581681600@cmsa.fas.harvard.edu
SUMMARY:2/14/2020 General Relativity Seminar
DESCRIPTION:
URL:https://cmsa.fas.harvard.edu/event/2-14-2020-general-relativity-seminar/
LOCATION:MA
CATEGORIES:General Relativity Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20200213T103000
DTEND;TZID=America/New_York:20200213T120000
DTSTAMP:20260513T121047
CREATED:20240212T084133Z
LAST-MODIFIED:20240212T084133Z
UID:10001893-1581589800-1581595200@cmsa.fas.harvard.edu
SUMMARY:2/13/2020 Condensed Matter Seminar
DESCRIPTION:
URL:https://cmsa.fas.harvard.edu/event/2-13-2020-condensed-matter-seminar/
LOCATION:MA
CATEGORIES:Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20200212T103000
DTEND;TZID=America/New_York:20200212T120000
DTSTAMP:20260513T121047
CREATED:20240212T084359Z
LAST-MODIFIED:20240212T084359Z
UID:10001894-1581503400-1581508800@cmsa.fas.harvard.edu
SUMMARY:2/12/2020 Quantum Matter Seminar
DESCRIPTION:
URL:https://cmsa.fas.harvard.edu/event/2-12-2020-quantum-matter-seminar/
LOCATION:MA
CATEGORIES:Quantum Matter
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20200210T120000
DTEND;TZID=America/New_York:20200210T130000
DTSTAMP:20260513T121047
CREATED:20240212T091426Z
LAST-MODIFIED:20240212T091426Z
UID:10001905-1581336000-1581339600@cmsa.fas.harvard.edu
SUMMARY:2/10/2020 Math-Physics Seminar
DESCRIPTION:
URL:https://cmsa.fas.harvard.edu/event/2-10-2020-math-physics-seminar/
LOCATION:MA
CATEGORIES:Mathematical Physics Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20200207T163000
DTEND;TZID=America/New_York:20200207T173000
DTSTAMP:20260513T121047
CREATED:20240212T090243Z
LAST-MODIFIED:20240507T203547Z
UID:10001899-1581093000-1581096600@cmsa.fas.harvard.edu
SUMMARY:A Compact\, Logical Approach to Large-Market Analysis
DESCRIPTION:Speaker: Scott Duke Kominers (Harvard)\n\nTitle: A Compact\, Logical Approach to Large–Market Analysis\n\nAbstract: In game theory\, we often use infinite models to represent “limit” settings\, such as markets with a large number of agents or games with a long time horizon. Yet many game-theoretic models incorporate finiteness assumptions that\, while introduced for simplicity\, play a real role in the analysis. Here\, we show how to extend key results from (finite) models of matching\, games on graphs\, and trading networks to infinite models by way of Logical Compactness\, a core result from Propositional Logic. Using Compactness\, we prove the existence of man-optimal stable matchings in infinite economies\, as well as strategy-proofness of the man-optimal stable matching mechanism. We then use Compactness to eliminate the need for a finite start time in a dynamic matching model. Finally\, we use Compactness to prove the existence of both Nash equilibria in infinite games on graphs and Walrasian equilibria in infinite trading networks.
URL:https://cmsa.fas.harvard.edu/event/2-12-2020-colloquium/
LOCATION:CMSA\, 20 Garden Street\, Cambridge\, MA\, 02138\, United States
CATEGORIES:Colloquium
ATTACH;FMTTYPE=image/png:https://cmsa.fas.harvard.edu/media/CMSA-Colloquium-02.12.20-1.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20200207T103000
DTEND;TZID=America/New_York:20200207T120000
DTSTAMP:20260513T121047
CREATED:20240212T090621Z
LAST-MODIFIED:20240307T100558Z
UID:10001901-1581071400-1581076800@cmsa.fas.harvard.edu
SUMMARY:2/7/2020 General Relativity
DESCRIPTION:
URL:https://cmsa.fas.harvard.edu/event/2-7-2020-general-relativity/
LOCATION:MA
CATEGORIES:General Relativity Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20200206T103000
DTEND;TZID=America/New_York:20200206T120000
DTSTAMP:20260513T121047
CREATED:20240212T091828Z
LAST-MODIFIED:20240212T091828Z
UID:10001908-1580985000-1580990400@cmsa.fas.harvard.edu
SUMMARY:2/06/2020 Condensed Matter Seminar
DESCRIPTION:
URL:https://cmsa.fas.harvard.edu/event/2-06-2020-condensed-matter-seminar/
LOCATION:MA
CATEGORIES:Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20200205T163000
DTEND;TZID=America/New_York:20200205T173000
DTSTAMP:20260513T121047
CREATED:20240212T090826Z
LAST-MODIFIED:20240507T204003Z
UID:10001902-1580920200-1580923800@cmsa.fas.harvard.edu
SUMMARY:Gentle Measurement of Quantum States and Differential Privacy
DESCRIPTION:Speaker: Scott Aaronson (University of Texas at Austin) \nTitle: Gentle Measurement of Quantum States and Differential Privacy \nAbstract: I’ll discuss a recent connection between two seemingly unrelated problems: how to measure a collection of quantum states without damaging them too much (“gentle measurement”)\, and how to provide statistical data without leaking too much about individuals (“differential privacy\,” an area of classical CS). This connection leads\, among other things\, to a new protocol for “shadow tomography” of quantum states (that is\, answering a large number of questions about a quantum state given few copies of it). Based on joint work with Guy Rothblum (arXiv:1904.08747).
URL:https://cmsa.fas.harvard.edu/event/2-5-2020-colloquium/
LOCATION:CMSA\, 20 Garden Street\, Cambridge\, MA\, 02138\, United States
CATEGORIES:Colloquium
ATTACH;FMTTYPE=image/png:https://cmsa.fas.harvard.edu/media/CMSA-Colloquium-02.05.20-1-1-1.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20200205T103000
DTEND;TZID=America/New_York:20200205T120000
DTSTAMP:20260513T121047
CREATED:20240212T092131Z
LAST-MODIFIED:20240307T094352Z
UID:10001911-1580898600-1580904000@cmsa.fas.harvard.edu
SUMMARY:2/5/2020 Quantum Matter seminar
DESCRIPTION:
URL:https://cmsa.fas.harvard.edu/event/2-5-2020-quantum-matter-seminar/
LOCATION:MA
CATEGORIES:Quantum Matter
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20200203T120000
DTEND;TZID=America/New_York:20200203T130000
DTSTAMP:20260513T121047
CREATED:20240212T091951Z
LAST-MODIFIED:20240212T091951Z
UID:10001909-1580731200-1580734800@cmsa.fas.harvard.edu
SUMMARY:2/3/2020 Math-Physics Seminar
DESCRIPTION:
URL:https://cmsa.fas.harvard.edu/event/2-3-2020-math-physics-seminar/
LOCATION:MA
CATEGORIES:Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20200203T120000
DTEND;TZID=America/New_York:20200203T130000
DTSTAMP:20260513T121047
CREATED:20240212T091104Z
LAST-MODIFIED:20240212T091104Z
UID:10001903-1580731200-1580734800@cmsa.fas.harvard.edu
SUMMARY:2/3/2020 Math-Physics
DESCRIPTION:
URL:https://cmsa.fas.harvard.edu/event/2-3-2020-math-physics/
LOCATION:MA
CATEGORIES:Mathematical Physics Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20200129T163000
DTEND;TZID=America/New_York:20200129T173000
DTSTAMP:20260513T121047
CREATED:20240212T090021Z
LAST-MODIFIED:20240507T203431Z
UID:10001898-1580315400-1580319000@cmsa.fas.harvard.edu
SUMMARY:Data-intensive Innovation and the State: Evidence from AI Firms in China
DESCRIPTION:Speaker: David Yang (Harvard)\n\nTitle: Data–intensive Innovation and the State: Evidence from AI Firms in China\n\nAbstract: Data–intensive technologies such as AI may reshape the modern world. We propose that two features of data interact to shape innovation in data–intensive economies: first\, states are key collectors and repositories of data; second\, data is a non-rival input in innovation. We document the importance of state-collected data for innovation using comprehensive data on Chinese facial recognition AI firms and government contracts. Firms produce more commercial software and patents\, particularly data–intensive ones\, after receiving government public security contracts. Moreover\, effects are largest when contracts provide more data. We then build a directed technical change model to study the state’s role in three applications: autocracies demanding AI for surveillance purposes\, data-driven industrial policy\, and data regulation due to privacy concerns. When the degree of non-rivalry is as strong as our empirical evidence suggests\, the state’s collection and processing of data can shape the direction of innovation and growth of data–intensive economies.
URL:https://cmsa.fas.harvard.edu/event/1-29-2020-colloquium/
LOCATION:MA
CATEGORIES:Colloquium
ATTACH;FMTTYPE=image/png:https://cmsa.fas.harvard.edu/media/CMSA-Colloquium-01.29.20-1.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20191218T120000
DTEND;TZID=America/New_York:20191218T130000
DTSTAMP:20260513T121047
CREATED:20240212T091247Z
LAST-MODIFIED:20240212T091247Z
UID:10001904-1576670400-1576674000@cmsa.fas.harvard.edu
SUMMARY:12/18/2019 Quantum Matter Seminar
DESCRIPTION:
URL:https://cmsa.fas.harvard.edu/event/12-18-2019-quantum-matter-seminar/
LOCATION:MA
CATEGORIES:Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20191212T115000
DTEND;TZID=America/New_York:20191212T130000
DTSTAMP:20260513T121047
CREATED:20240212T091738Z
LAST-MODIFIED:20240212T091738Z
UID:10001907-1576151400-1576155600@cmsa.fas.harvard.edu
SUMMARY:12/12/2019 Quantum Matter Seminar
DESCRIPTION:
URL:https://cmsa.fas.harvard.edu/event/12-12-2019-quantum-matter-seminar/
LOCATION:MA
CATEGORIES:Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20191211T103000
DTEND;TZID=America/New_York:20191211T120000
DTSTAMP:20260513T121047
CREATED:20240212T092101Z
LAST-MODIFIED:20240212T092101Z
UID:10001910-1576060200-1576065600@cmsa.fas.harvard.edu
SUMMARY:12/11/2019 Quantum Matter Seminar
DESCRIPTION:
URL:https://cmsa.fas.harvard.edu/event/12-11-2019-quantum-matter-seminar/
LOCATION:MA
CATEGORIES:Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20191210T143000
DTEND;TZID=America/New_York:20191210T143000
DTSTAMP:20260513T121047
CREATED:20240212T094638Z
LAST-MODIFIED:20240212T094638Z
UID:10001930-1575988200-1575988200@cmsa.fas.harvard.edu
SUMMARY:12/10/2019 Spacetime Seminar
DESCRIPTION:
URL:https://cmsa.fas.harvard.edu/event/12-10-2019-spacetime-seminar/
LOCATION:MA
CATEGORIES:Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20191207T100000
DTEND;TZID=America/New_York:20191207T110000
DTSTAMP:20260513T121047
CREATED:20240212T080135Z
LAST-MODIFIED:20240212T080135Z
UID:10001880-1575712800-1575716400@cmsa.fas.harvard.edu
SUMMARY:Mathematical Physics Seminar\, Mondays
DESCRIPTION:The seminar on mathematical physics will be held on Mondays from 10:00 – 11:00am ET on Zoom. Please email the seminar organizers to learn how toattend. This year’s Seminar will be organized by Yoosik Kim (yoosik@cmsa.fas.harvard.edu)\, Tsung-Ju Lee (tjlee@cmsa.fas.harvard.edu)\, and Yang Zhou (yangzhou@cmsa.fas.harvard.edu). \nJoin the Math-Physics mailing list \nThe list of speakers for the upcoming academic year will be posted below and updated as details are confirmed. Titles and abstracts for the talks will be added as they are received. \nSpring 2021:\n\n\n\n\nDate\nSpeaker\nTitle/Abstract\n\n\n\n\n2/1/2021\nChoa Dongwook\n(KIAS)Video\nTitle: Fukaya category of Landau-Ginzburg orbifolds. \nAbstract: Landau-Ginzburg orbifold is just another name for a holomorphic function W with its abelian symmetry G. Its Fukaya category can be viewed as a categorification of a homology group of its Milnor fiber. In this introductory talk\, we will start with some classical results on the topology of isolated singularities and its Fukaya-Seidel category. Then I will explain a new construction for such category to deal with a non-trivial symmetry group G. The main ingredients are classical variation map and the Reeb dynamics at the contact boundary. If time permits\, I will show its application to mirror symmetry of LG orbifolds and its Milnor fiber. This is a joint work with C.-H. Cho and W. Jeong\n\n\n2/8/2021\nJérémy Guéré (Fourier Institute)\nTitle: Congruences on K-theoretic Gromov-Witten invariants \nAbstract: K-theoretic Gromov-Witten invariants of smooth projective varieties have been introduced by YP Lee\, using the Euler characteristic of a virtual structure sheaf. In particular\, they are integers. In this talk\, I look at these invariants for the quintic threefold and I will explain how to compute them modulo 41\, using the virtual localization formula under a finite group action\, up to genus 19 and degree 40.\n\n\n2/15/2021\nZhiwei Zheng (Max Planck Institute) \nVideo\nTitle: Some new results on automorphisms of hypersurfaces \nAbstract: It is natural to study automorphisms of hypersurfaces in projective spaces. In this talk\, I will discuss a new approach to determine all possible orders of automorphisms of smooth hypersurfaces with fixed degree and dimension. Then we consider the specific case of cubic fourfolds\, and discuss the relation with Hodge theory.\n\n\n2/22/2021\nYu-Shen Lin (Boston University) \nVideo\nTitle: Full SYZ Conjecture for del Pezzo Surfaces and Rational Elliptic Surfaces \nAbstract: Strominger–Yau–Zaslow conjecture predicts the existence of special Lagrangian fibrations on Calabi–Yau manifolds. The conjecture inspires the development of mirror symmetry while the original conjecture has little progress. In this talk\, I will confirm the conjecture for the complement of a smooth anti-canonical divisor in del Pezzo surfaces. Moreover\, I will also construct the dual torus fibration on its mirror. As a consequence\, the special Lagrangian fibrations detect a non-standard semi-flat metric and some Ricci-flat metrics that don’t obviously appear in the literature. This is based on a joint work with T. Collins and A. Jacob.\n\n\n3/1/2021\nCarlos S. Shahbazi (Hamburg University) \nVideo\nTitle: Mathematical supergravity and its applications to differential geometry. \nAbstract: I will discuss the recent developments in the mathematical theory of supergravity that lay the mathematical foundations of the universal bosonic sector of four-dimensional ungauged supergravity and its Killing spinor equations in a differential-geometric framework.  I will provide the necessary context and background. explaining the results pedagogically from scratch and highlighting several open mathematical problems which arise in the mathematical theory of supergravity\, as well as some of its potential mathematical applications. Work in collaboration with Vicente Cortés and Calin Lazaroiu.\n\n\n3/8/2021\nMiguel Moreira (ETH) \nVideo\nTitle: Virasoro constraints for stable pairs. \nAbstract: The theory of stable pairs (PT) with descendents\, defined on a 3-fold X\, is a sheaf theoretical curve counting theory. Conjecturally\, it is equivalent to the Gromov-Witten (GW) theory of X via a universal (but intricate) transformation\, so we can expect that the Virasoro conjecture on the GW side should have a parallel in the PT world. In joint work with A. Oblomkov\, A. Okounkov\, and R. Pandharipande\, we formulated such a conjecture and proved it for toric 3-folds in the stationary case. The Hilbert scheme of points on a surface S might be regarded as a component of the moduli space of stable pairs on S x P1\, and the Virasoro conjecture predicts a new set of relations satisfied by tautological classes on S[n] which can be proven by reduction to the toric case.\n\n\n3/15/2021\nSpring break\n\n\n\n3/22/2021\nYing Xie (Shanghai Center for Mathematical Sciences)\nTitle: Derived categories for Grassmannian flips \nAbstract: Flip is a fundamental surgery operation for constructing minimal models in higher-dimensional birational geometry. In this talk\, I will introduce a series of flips from Lie theory and investigate their derived categories. This is a joint program with Conan Leung.\n\n\n3/29/2021\nEmanuel Scheidegger (Peking University)\nTitle:  On the quantum K-theory of the quintic.\n\nAbstract: Quantum cohomology is a deformation of the cohomology of a projective variety governed by counts of stable maps from a curve into this variety. Quantum K-theory is in a similar way a deformation of K-theory but also of quantum cohomology\, It has recently attracted attention in physics since a realization in a physical theory has been found. Currently\, both the structure and examples in quantum K-theory are far less understood than in quantum cohomology.\nWe will explain the properties of quantum K-theory in comparison with quantum cohomology\, and we will discuss the examples of projective space and the quintic hypersurface in P^4.\n\n\n4/5/2021\nGaëtan Borot (HU Berlin) \nVideo\nTitle: Topological recursion in 4d N = 2 supersymmetric gauge theories \nAbstract: According to the Alday-Gaiotto-Tachikawa conjecture (proved in this case by Schiffman and Vasserot)\, the instanton partition function in 4d N = 2 SU(r) supersymmetric gauge theory on P^2 with equivariant parameters \epsilon_1\,\epsilon_2 is the norm of a Whittaker vector for W(gl_r) algebra. I will explain how these Whittaker vectors can be computed (at least perturbatively in the energy scale) by topological recursion for \epsilon_1 +\epsilon_2 = 0\, and by a non-commutation version of the topological recursion in the Nekrasov-Shatashvili regime where \epsilon_1/\epsilon_2 is fixed. This is a joint work to appear with Bouchard\, Chidambaram and Creutzig.\n\n\n4/12/2021\nFei Yan (Rutgers)\nTitle: Networks and quantization \nAbstract: I will describe two quantization scenarios. The first scenario involves the construction of a quantum trace map computing a link “invariant” (with possible wall-crossing behavior) for links L in a 3-manifold M\, where M is a Riemann surface C times a real line. This construction unifies the computation of familiar link invariant with the refined counting of framed BPS states for line defects in 4d N=2 theories of class S. Certain networks on C play an important role in the construction. The second scenario concerns the study of Schroedinger equations and their higher order analogues\, which could arise in the quantization of Seiberg-Witten curves in 4d N=2 theories. Here similarly certain networks play an important part in the exact WKB analysis for these Schroedinger-like equations. At the end of my talk I will also try to sketch a possibility to bridge these two scenarios.\n\n\n4/19/2021\nHazel Mak (Brown University)\nTitle: Branching Rules and Young Tableaux Methods: 10D & 11D Supergravity \nAbstract: In this talk\, I will review 4D\, N = 1 off-shell supergravity. Then I present explorations to construct 10D and 11D supergravity theories in two steps. The first step is to decompose scalar superfield into Lorentz group representations which involves branching rules and related methods. Interpretations of component fields by Young tableaux methods will be presented. The second step is to implement an analogue of Breitenlohner’s approach for 4D supergravity to 10D and 11D theories.\n\n\n4/26/2021\nOwen Gwilliam (UMass. Amherst) \nVideo\nTitle: Topological-holomorphic field theories and their BV quantizations \nAbstract: Topological field theories and holomorphic field theories have each had a substantial impact in both physics and mathematics\, so it is natural to consider theories that are hybrids of the two\, which we call topological-holomorphic and denote as THFTs. Examples include Kapustin’s twist of N=2\, D=4 supersymmetric Yang-Mills theory and Costello’s 4-dimensional Chern-Simons theory. In this talk about joint work with Rabinovich and Williams\, I will define THFTs\, describe several examples\, and then explain how to quantize them rigorously and explicitly\, by building on techniques of Si Li.  Time permitting\, I will indicate how these results offer a novel perspective on the Gaudin model via 3-dimensional field theories.\n\n\n\n\n\nFall 2020:\n\n\n\n\nDate\nSpeaker\nTitle/Abstract\n\n\n\n\n9/14/2020\nLino Amorim (Kansas State University)\nTitle: Non-commutative Gromov-Witten invariants \nAbstract:  I will describe an analogue of Saito’s theory of primitive forms for Calabi-Yau A-infinity categories. Under some conditions on the Hochschild cohomology of the category\, this construction recovers the (genus zero) Gromov-Witten invariants of a symplectic manifold from its Fukaya category. This includes many compact toric manifolds\, in particular projective spaces.\n\n\n9/21/2020\nYuhan Sun (Rutgers)\nTitle: Displacement energy of Lagrangian 3-spheres \nAbstract:  We study local and global Hamiltonian dynamical behaviors of some Lagrangian submanifolds near a Lagrangian sphere S in a symplectic manifold X. When dim S = 2\, we show that there is a one-parameter family of Lagrangian tori near S\, which are nondisplaceable in X. When dim S = 3\, we obtain a new estimate of the displacement energy of S\, by estimating the displacement energy of a one-parameter family of Lagrangian tori near S.\n\n\n9/28/2020\nShota Komatsu (CERN)\nTitle: Wilson loops as matrix product states \nAbstract:  In this talk\, I will discuss a reformulation of the Wilson loop in large N gauge theories in terms of matrix product states. The construction is motivated by the analysis of supersymmetric Wilson loops in the maximally super Yang–Mills theory in four dimensions\, but can be applied to any other large N gauge theories and matrix models\, although less effective. For the maximally super Yang–Mills theory\, one can further perform the computation exactly as a function of ‘t Hooft coupling by combining our formulation with the relation to integrable spin chains.\n\n\n10/5/2020\nMing Zhang (UBC)\nTitle: Verlinde/Grassmannian correspondence and applications. \nAbstract: In the 90s’\, Witten gave a physical derivation of an isomorphism between the Verlinde algebra of $GL(n)$ of level $l$ and the quantum cohomology ring of the Grassmannian $\text{Gr}(n\,n+l)$. In the joint work arXiv:1811.01377 with Yongbin Ruan\, we proposed a K-theoretic generalization of Witten’s work by relating the $\text{GL}_{n}$ Verlinde numbers to the level $l$ quantum K-invariants of the Grassmannian $\text{Gr}(n\,n+l)$\, and refer to it as the Verlinde/Grassmannian correspondence. \nThe correspondence was formulated precisely in the aforementioned paper\, and we proved the rank 2 case (n=2) there. In this talk\, I will discuss the proof for arbitrary rank. A new technical ingredient is the virtual nonabelian localization formula developed by Daniel Halpern-Leistner.  At the end of the talk\, I will describe some applications of this correspondence.\n\n\n10/12/2020\nCancelled -Columbus Day\n\n\n\n10/19/2020\nBen Gammage (Harvard)\nTitle: 3d mirror symmetry for abelian gauge groups \nAbstract: 3d mirror symmetry is a proposed duality relating a pair of 3-dimensional supersymmetric gauge theories. Various consequences of this duality have been heavily explored by representation theorists in recent years\, under the name of “symplectic duality”. In joint work in progress with Justin Hilburn\, for the case of abelian gauge groups\, we provide a fully mathematical explanation of this duality in the form of an equivalence of 2-categories of boundary conditions for topological twists of these theories. We will also discuss some applications to homological mirror symmetry and geometric Langlands duality.\n\n\n10/26/2020\nCancelled\n\n\n\n11/2/2020\nHaoyu Sun (Berkeley)\nTitle: Double-Janus linear sigma models and generalized quadratic reciprocity\n\nAbstract: We study the supersymmetric partition function of a 2d linear sigma-model whose target space is a torus with a complex structure that varies along one worldsheet direction and a Kähler modulus that varies along the other. This setup is inspired by the dimensional reduction of a Janus configuration of 4d N=4 U(1) Super-Yang-Mills theory compactified on a mapping torus (T^2 fibered over S^1) times a circle with an SL(2\,Z) duality wall inserted on S^1\, but our setup has minimal supersymmetry. The partition function depends on two independent elements of SL(2\,Z)\, one describing the duality twist\, and the other describing the geometry of the mapping torus. It is topological and can be written as a multivariate quadratic Gauss sum. By calculating the partition function in two different ways\, we obtain identities relating different quadratic Gauss sums\, generalizing the Landsberg-Schaar relation. These identities are a subset of a collection of identities discovered by F. Deloup. Each identity contains a phase which is an eighth root of unity\, and we show how it arises as a Berry phase in the supersymmetric Janus-like configuration. Supersymmetry requires the complex structure to vary along a semicircle in the upper half-plane\, as shown by Gaiotto and Witten in a related context\, and that semicircle plays an important role in reproducing the correct Berry phase.\n\n\n11/9/2020\nAn Huang (Brandeis)\nTitle: p-adic strings\, Einstein equations\, Green’s functions\, and Tate’s thesis\n\nAbstract: I shall discuss a recent work on how p-adic strings can produce perturbative quantum gravity\, and an adelic physics interpretation of Tate’s thesis.\n\n\n11/16/2020\n10:00am ET\nMatt Kerr (WUSTL)\nTitle:  Differential equations and mixed Hodge structures \nAbstract: We report on a new development in asymptotic Hodge theory\, arising from work of Golyshev–Zagier and Bloch–Vlasenko\, and connected to the Gamma Conjectures in Fano/LG-model mirror symmetry.  The talk will focus exclusively on the Hodge/period-theoretic aspects through two main examples.\nGiven a variation of Hodge structure M on a Zariski open in P^1\, the periods of the limiting mixed Hodge structures at the punctures are interesting invariants of M.  More generally\, one can try to compute these asymptotic invariants for iterated extensions of M by “Tate objects”\, which may arise for example from normal functions associated to algebraic cycles. The main point of the talk will be that (with suitable assumptions on M) these invariants are encoded in an entire function called the motivic Gamma function\, which is determined by the Picard-Fuchs operator L underlying M. In particular\, when L is hypergeometric\, this is easy to compute and we get a closed-form answer (and a limiting motive).  In the non-hypergeometric setting\, it yields predictions for special values of normal functions; this part of the story is joint with V. Golyshev and T. Sasaki.\n\n\n11/23/2020 \n11:30am ET\nKyoung-Seog Lee (U of Miami)\nTitle: Derived categories and motives of moduli spaces of vector bundles on curves \nAbstract: Derived categories and motives are important invariants of algebraic varieties invented by Grothendieck and his collaborators around 1960s. In 2005\, Orlov conjectured that they will be closely related and now there are several evidences supporting his conjecture. On the other hand\, moduli spaces of vector bundles on curves provide attractive and important examples of algebraic varieties and there have been intensive works studying them. In this talk\, I will discuss derived categories and motives of moduli spaces of vector bundles on curves. This talk is based on joint works with I. Biswas and T. Gomez.\n\n\n11/30/2020\nZijun Zhou (IPMU)\nTitle: 3d N=2 toric mirror symmetry and quantum K-theory \nAbstract: In this talk\, I will introduce a new construction for the K-theoretic mirror symmetry of toric varieties/stacks\, based on the 3d N=2 mirror symmetry introduced by Dorey-Tong. Given the toric datum\, i.e. a  short exact sequence 0 -> Z^k -> Z^n -> Z^{n-k} -> 0\, we consider the toric Artin stack of the form [C^n / (C^*)^k]. Its mirror is constructed by taking the Gale dual of the defining short exact sequence. As an analogue of the 3d N=4 case\, we consider the K-theoretic I-function\, with a suitable level structure\, defined by counting parameterized quasimaps from P^1. Under mirror symmetry\, the I-functions of a mirror pair are related to each other under the mirror map\, which exchanges the K\”ahler and equivariant parameters\, and maps q to q^{-1}. This is joint work with Yongbin Ruan and Yaoxiong Wen.\n\n\n12/7/2020\nThomas Grimm (Utrecht)\nTitle: Moduli Space Holography and the Finiteness of Flux Vacua \nAbstract: In this talk I describe a holographic perspective to study field spaces that arise in string compactifications. The constructions are motivated by a general description of the asymptotic\, near-boundary regions in complex structure moduli spaces of Calabi-Yau manifolds using asymptotic Hodge theory. For real two-dimensional field spaces\, I introduce an auxiliary bulk theory and describe aspects of an associated sl(2) boundary theory. The bulk reconstruction from the boundary data is provided by the sl(2)-orbit theorem of Schmid and Cattani\, Kaplan\, Schmid\, which is a famous and general result in Hodge theory. I then apply this correspondence to the flux landscape of Calabi-Yau fourfold compactifications and discuss how this allows us\, in work with C. Schnell\, to prove that the number of self-dual flux vacua is finite\n\n\n\n\nFor a listing of previous Mathematical Physics Seminars\, please click here.
URL:https://cmsa.fas.harvard.edu/event/mathematical-physics-seminar-mondays/
LOCATION:MA
CATEGORIES:Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20191206T130000
DTEND;TZID=America/New_York:20191206T140000
DTSTAMP:20260513T121047
CREATED:20240212T092836Z
LAST-MODIFIED:20240212T092859Z
UID:10001914-1575637200-1575640800@cmsa.fas.harvard.edu
SUMMARY:12/6/2019 Special Seminar
DESCRIPTION:
URL:https://cmsa.fas.harvard.edu/event/12-6-2019-special-seminar/
LOCATION:MA
CATEGORIES:Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20191205T115000
DTEND;TZID=America/New_York:20191205T130000
DTSTAMP:20260513T121047
CREATED:20240212T093120Z
LAST-MODIFIED:20240212T093120Z
UID:10001916-1575546600-1575550800@cmsa.fas.harvard.edu
SUMMARY:12/5/2019 Condensed Matter Seminar
DESCRIPTION:
URL:https://cmsa.fas.harvard.edu/event/12-5-2019-condensed-matter-seminar/
LOCATION:MA
CATEGORIES:Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20191204T163000
DTEND;TZID=America/New_York:20191204T173000
DTSTAMP:20260513T121047
CREATED:20240212T092619Z
LAST-MODIFIED:20240507T204529Z
UID:10001912-1575477000-1575480600@cmsa.fas.harvard.edu
SUMMARY:Emergence of graviton-like excitations from a lattice model
DESCRIPTION:Speaker: Xiao-Gang Wen (MIT)\n\nTitle: Emergence of graviton–like excitations from a lattice model\n\nAbstract: I will review some construction of lattice rotor model which give rise to emergent photons and graviton–like excitations. The appearance of vector-like charge and symmetric tensor field may be related to gapless fracton phases.
URL:https://cmsa.fas.harvard.edu/event/colloquium-12-4-2019/
LOCATION:MA
CATEGORIES:Colloquium
ATTACH;FMTTYPE=image/png:https://cmsa.fas.harvard.edu/media/CMSA-Colloquium-12.04.19-1.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20191202T120000
DTEND;TZID=America/New_York:20191202T130000
DTSTAMP:20260513T121047
CREATED:20240212T094003Z
LAST-MODIFIED:20240212T094003Z
UID:10001923-1575288000-1575291600@cmsa.fas.harvard.edu
SUMMARY:12/2/2019 Math Physics Seminar
DESCRIPTION:
URL:https://cmsa.fas.harvard.edu/event/12-2-2019-math-physics-seminar/
LOCATION:MA
CATEGORIES:Seminars
END:VEVENT
END:VCALENDAR