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DTSTART;TZID=America/New_York:20260128T160000
DTEND;TZID=America/New_York:20260128T173000
DTSTAMP:20260501T123915
CREATED:20260116T182955Z
LAST-MODIFIED:20260116T182955Z
UID:10003871-1769616000-1769621400@cmsa.fas.harvard.edu
SUMMARY:CMSA Spring Welcome Back Event
DESCRIPTION:CMSA Spring Welcome Back Event \nDate: Jan 28\, 2026 \nTime: 4:00 pm \nLocation: CMSA Common Room\, 20 Garden Street\, Cambridge MA \nAll CMSA and Math affiliates are invited.
URL:https://cmsa.fas.harvard.edu/event/welcome126/
LOCATION:20 Garden Street\, Cambridge\, MA 02138\, MA\, MA\, 02138\, United States
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20241028T093000
DTEND;TZID=America/New_York:20241028T103000
DTSTAMP:20260501T123915
CREATED:20240918T132207Z
LAST-MODIFIED:20241018T172052Z
UID:10003518-1730107800-1730111400@cmsa.fas.harvard.edu
SUMMARY:Foundation Seminar: Singularity Theorems\, Part II
DESCRIPTION:Foundation Seminar (Joint Seminar with BHI) \nLocation: BHI \nTitle: Singularity Theorems\, Part II \nJournal Club Discussion
URL:https://cmsa.fas.harvard.edu/event/foundation-seminar_102824/
LOCATION:20 Garden Street\, Cambridge\, MA 02138\, MA\, MA\, 02138\, United States
CATEGORIES:Foundation Seminar
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20240906T090000
DTEND;TZID=America/New_York:20240907T170000
DTSTAMP:20260501T123915
CREATED:20240325T141950Z
LAST-MODIFIED:20250415T154033Z
UID:10003287-1725613200-1725728400@cmsa.fas.harvard.edu
SUMMARY:Big Data Conference 2024
DESCRIPTION:  \n \nYoutube Playlist \nOn September 6-7\, 2024\, the CMSA hosted the tenth annual Conference on Big Data. The Big Data Conference features speakers from the Harvard community as well as scholars from across the globe\, with talks focusing on computer science\, statistics\, math and physics\, and economics. \nLocation: Harvard University CMSA\, 20 Garden Street\, Cambridge & via Zoom \n  \nSpeakers: \n\nTianxi Cai\, Harvard Chan School\nRaj Chetty\, Harvard\nBianca Dumitrascu\, Columbia\nBoris Hanin\, Princeton\nPeter Hull\, Brown\nJamie Morgenstern\, U Washington\nKavita Ramanan\, Brown\nNeil Thompson\, MIT\nMelanie Weber\, Harvard\nKun-Hsing Yu\, Harvard Medical School\n\nOrganizers: \n\nRediet Abebe\, Harvard Society of Fellows\nMorgane Austern\, Harvard University Statistics\nMichael R. Douglas\, Harvard CMSA\nYannai Gonczarowski\, Harvard University Economics and Computer Science\nSam Kou\, Harvard University Statistics\n\nSCHEDULE (downloadable pdf) \nFriday\, Sep. 6\, 2024 \n9:00 am: Breakfast \n9:30 am: Introductions \n9:45–10:45 am\nSpeaker: Peter Hull\, Brown University\nTitle: Measuring Discrimination in Multi-Phase Systems\, with an Application to Child Protection\nAbstract: Large racial disparities have been documented in many high-stakes settings—such as employment\, health care\, housing\, and criminal justice—raising concerns of discrimination by individual decision-makers. At the same time\, there is growing understanding that a focus on individual decisions can yield an incomplete view of discrimination; an extensive theoretical literature shows how discrimination can arise and compound across multiple decision-makers in interconnected systems. We develop new empirical tools for studying discrimination in such multi-phase systems and apply them to the setting of foster care placement by child protective services. Leveraging the quasi-random assignment of two sets of decision-makers—initial hotline call screeners and subsequent investigators—we study how unwarranted racial disparities arise and propagate through this system. Using a sample of over 200\,000 maltreatment allegations\, we find that calls involving Black children are 55% more likely to result in foster care placement than calls involving white children with the same potential for future maltreatment in the home. Call screeners account for up to 19% of this unwarranted disparity\, with the remainder due to investigators. Unwarranted disparity is concentrated in cases with potential for future maltreatment\, suggesting that white children may be harmed by “underplacement” in high-risk situations. \n10:45–11:00 am: Break \n11:00 am –12:00 pm\nSpeaker: Jamie Morgenstern\, U Washington\nTitle: What governs predictive disparity in modern machine learning applications?\nAbstract: The deployment of statistical models in impactful environments is far from new—simple correlations have been used to guide decisions throughout the sciences\, health care\, political campaigns\, and in pricing financial instruments and other products for decades. Many such models\, and the decisions they supported\, were known to have different degrees of predictive power for different demographic groups. These differences had numerous sources\, including: limited expressiveness of the statistical models; limited availability of data from marginalized populations; noisier measurements of both features and targets from certain populations; and features with less mutual information about the prediction target for some populations than others.\nModern decision systems which use machine learning are more ubiquitous than ever\, as are their differences in performance for different populations of people. In this talk\, I will discuss some similarities and differences in the sources of differing performance in contemporary ML systems including facial recognition systems and those incorporating generative AI. \n12:00–1:30 pm: Lunch Break \n1:30–2:30 pm\nSpeaker: Kavita Ramanan\, Brown University\nTitle: Understanding High-dimensional Stochastic Dynamics on Realistic Networks\nAbstract: Large collections of randomly evolving particles that interact locally with respect to an underlying network model a variety of phenomena ranging from magnetism\, the spread of diseases\, neural and neuronal networks\, opinion dynamics and load balancing on computer networks. Due to their high-dimensional nature\, these systems are typically intractable to analyze exactly. Classical work\, falling under the rubric of mean-field approximations\, has mostly focused on the case when this interaction graph is dense.  However\, most real-world networks are sparse and often random. We describe a new approach to develop principled approximations for dynamics on realistic networks that beats the curse of dimensionality\, and illustrate its efficacy on a class of epidemiological models. This is based on joint works with Michel Davydov\, Ankan Ganguly and Juniper Cocomello. \n2:30–2:45 pm: Break \n2:45–3:45 pm\nSpeaker: Raj Chetty\, Harvard University\nTitle: The Science of Economic Opportunity: New Insights from Big Data\nAbstract: How can we improve economic opportunities for children growing up in low-income families? This talk will present findings from a recent set of studies that use various sources of big data — ranging from anonymized tax records to social network data — to understand the science of economic opportunity. Among other topics\, the talk will discuss how and why children’s chances of climbing the income ladder vary across neighborhoods\, the drivers of racial disparities in economic mobility\, how highly selective colleges may amplify the persistence of privilege\, and the role of social capital as a driver of upward mobility. The talk will conclude by giving examples of how academic research using big data is informing policy decisions from the local to federal level to expand opportunities for all. \n3:45–4:00 pm: Break \n4:00–5:00 pm\nSpeaker: Neil Thompson\nTitle: How Algorithmic Progress is driving progress in Big Data and AI\nAbstract: Algorithm improvement is one of the purest forms of innovation: it allows the same computational task to be achieved with far fewer resources by proposing clever new ways to do that computation. In this talk\, I will discuss the work that my lab has done tracking and quantifying progress across decades of algorithm research and practice. As I will show\, this algorithmic progress has often outpaced hardware improvement as the most important driver of progress in Big Data and AI. \n  \nSaturday\, Sep. 7\, 2024 \n9:00 am: Breakfast \n9:30 am: Introductions \n9:45–10:45 am\nSpeaker: Tianxi Cai\, Harvard Chan School\nTitle: Crowdsourcing with Multi-institutional EHR to Improve Reliability of Real World Evidence – Opportunities and Challenges\nAbstract: The wide adoption of electronic health records (EHR) systems has led to the availability of large clinical datasets available for discovery research. EHR data\, linked with bio- repository\, is a valuable new source for deriving real-word\, data-driven prediction models of disease risk and progression. Yet\, they also bring analytical difficulties especially when aiming to leverage multi-institutional EHR data. Synthesizing information across healthcare systems is challenging due to heterogeneity and privacy. Statistical challenges also arise due to high dimensionality in the feature space. In this talk\, I’ll discuss analytical approaches for mining EHR data to improve the reliability and generalizability of real world evidence generated from the analyses. These methods will be illustrated using EHR data from Mass General Brigham and Veteran Health Administration. \n10:45–11:00 am: Break \n11:00 am–12:00 pm\nSpeaker: Bianca Dumitrascu\, Columbia Data Science Institute\nTitle: Statistical machine learning for learning representations of embryonic development\nAbstract: During embryonic development\, single cells read in local information from their environments and use this information to move\, divide and specialize. As a result\, the environments themselves change.  However\, it remains unclear how gene expression programs interact with cell morphology and mechanical forces to orchestrate organogenesis in early embryos. Recent advances in single cell techniques and in toto imaging enable unique venues in exploring this link between genomics and biophysics\, which dynamically maps cells to organisms.\nIn this talk\, I will describe statistical machine learning frameworks aimed at understanding how tissue level mechanical and morphometric information impact gene expression patterns in spatio-temporal contexts. We use these tools to understand boundary formation in the early development of mouse embryos and to align data from light sheet recordings of pre-gastrulation development. \n12:00–1:30 pm: Lunch Break \n1:30–2:30 pm\nSpeaker: Melanie Weber\, Harvard Mathematics\nTitle: Data and Model Geometry in Deep Learning\nAbstract: Data with geometric structure is ubiquitous in machine learning. Often such structure arises from fundamental symmetries in the domain\, such as permutation-invariance in graphs and sets\, and translation-invariance in images. In this talk we discuss implications of this structure on the design and complexity of neural networks. Equivariant architectures\, which encode symmetries as inductive bias\, have shown great success in applications with geometric data\, but can suffer from instabilities as their depths increases. We propose a new architecture based on unitary group convolutions\, which allows for deeper networks with less instability. In the second part of the talk we discuss the impact of data and model geometry on the learnability of neural networks. We discuss learnability in several geometric settings\, including equivariant neural networks\, as well as learnability with respect to the geometry of the input data manifold. \n2:30–2:45 pm: Break \n2:45–3:45 pm\nSpeaker: Boris Hanin\, Princeton University\nTitle: Scaling Limits of Neural Networks\nAbstract: Neural networks are often studied analytically through scaling limits: regimes in which taking some structural network parameters (e.g. depth\, width\, number of training datapoints\, and so on) to infinity results in simplified models of learning. I will motivative and discuss recent results using several such approaches. I will emphasize both new theoretical insights into how model\, training data\, and optimizer impact learning and their practical implications for hyperparameter transfer. \n3:45–4:00 pm: Break \n4:00–5:00 pm\nSpeaker: Kun-Hsing Yu\, Harvard Medical School\nTitle: Foundation Models for Real-Time Cancer Diagnosis\nAbstract: Artificial intelligence (AI) is transforming the landscape of medical research and practice. Recent advances in microscopic image digitization\, foundation models\, and scalable computing infrastructure have opened new avenues for AI-enhanced cancer diagnosis. In this talk\, I will highlight recent breakthroughs in multi-modal AI systems for cancer pathology evaluation\, discuss integrative biomedical informatics methods that link cell morphology with molecular profiles\, and outline critical challenges in developing robust medical AI systems. \n  \n\nInformation about the 2023 Big Data Conference can be found here.
URL:https://cmsa.fas.harvard.edu/event/bigdata_2024/
LOCATION:20 Garden Street\, Cambridge\, MA 02138\, MA\, MA\, 02138\, United States
CATEGORIES:Big Data Conference,Conference,Event
ATTACH;FMTTYPE=image/png:https://cmsa.fas.harvard.edu/media/Big-Data-2024_8.5x11-1.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20240624T080000
DTEND;TZID=America/New_York:20240626T170000
DTSTAMP:20260501T123915
CREATED:20240415T161428Z
LAST-MODIFIED:20241212T160959Z
UID:10003355-1719216000-1719421200@cmsa.fas.harvard.edu
SUMMARY:Workshop on Fibration and Degeneration in Calabi-Yau Geometry
DESCRIPTION:Workshop on Fibration and Degeneration in Calabi-Yau Geometry \nDates: June 24-26\, 2024 \nLocation: Harvard CMSA\, 20 Garden Street\, Cambridge\, MA 02138 \nOrganizer: Chuck Doran\, Harvard CMSA \n\nCalabi-Yau manifolds occupy a central place in geometry. Their critical role as the cut-case between basic Fano building blocks and the zoo of General Type manifolds is key to the wide variety of important applications of Calabi-Yau geometry to theoretical physics. In turn\, ideas from theoretical physics\, such as Mirror Symmetry\, help shape investigations in Calabi-Yau geometry \nThis workshop focuses on a structural feature of Calabi-Yau geometry identified a decade ago by Doran\, Harder\, and Thompson. It is an organizing principle that conjecturally underlies any and all constructions of mirror pairs of Calabi-Yau manifolds. Put simply\, the DHT Mirror Symmetry slogan is: “Degeneration is mirror to fibration.” \n\n\nConfirmed Speakers: \n\nDavid Favero (University of Minnesota)\nAndrew Harder (Lehigh University)\nJesse Huang (University of Alberta)\nMohsen Karkheiran* (University of Alberta)\nMatt Kerr* (Washington University in St. Louis)\nThorsten Schimannek* (Utrecht University)\nMichael Schultz (Virginia Tech)\nAlan Thompson (Loughborough University)\nFenglong You (University of Nottingham & ETH Zurich)\n\n*= via Zoom \n  \nSchedule \nMonday\, June 24\, 2024 \n9:30 – 10:00 am: Breakfast \n10:00 – 11:00 am\nSpeaker: Alan Thompson\, Loughborough University\nTitle: Mirror symmetry for fibrations and degenerations of K3 surfaces\nAbstract: I will describe recent progress\, joint with Luca Giovenzana\, on the DHT problem for K3 surfaces. I will give an lattice-theoretic definition for when a Tyurin degeneration of K3 surfaces and an elliptically-fibred K3 surface\, with an appropriate splitting of the base\, form a mirror pair. I will then explain how this definition is compatible with lattice polarised mirror symmetry for K3 surfaces and with Fano-LG mirror symmetry for (quasi) del Pezzo surfaces. The upshot will be a concrete statement of the DHT conjecture for K3 surfaces. \n12:00 – 1:00: Lunch \n1:00 – 2:00 pm\nSpeaker: David Favero\, University of Minnesota\nTitle: Homotopy Path Algebras and Resolutions\nAbstract: A homotopy path algebra is like a directed version of the group ring on a fundamental group.  One can imagine a directed graph (quiver) embedded in a topological space and considering the path algebra up to homotopy.  Alternatively\, one can think of homotopy classes of directed paths in a stratified topological space.  I will introduce homotopy path algebras and describe their connections to mirror symmetry and resolutions of coherent sheaves on toric varieties. \n3:00 – 4:00 pm\nSpeaker: Andrew Harder\, Lehigh University\nTitle: Tropical Hodge theory for hypersurfaces and Clarke duality\nAbstract: Results of Itenberg\, Katzarkov\, Mikhalkin\, and Zharkov (IKMZ) show that if a projective variety admits a smooth tropicalization\, then there is a collection of sheaves on its tropicalization that can be used to compute its Hodge numbers. However\, smooth tropicalizations fail to exist even in the case of toric hypersurfaces. In work with Sukjoo Lee\, we show that for any toric hypersurface\, an analogue of IKMZ’s result holds. I’ll discuss this sheaf\, and how this allows us to prove that Clarke dual pairs of Landau-Ginzburg models satisfy a particular Hodge number duality. This is a vast generalization of work of Batyrev and Borisov from the 90s. \n4:00 – 4:30 pm: Coffee/Tea \n  \nTuesday\, June 25\, 2024 \n9:30 – 10:00 am: Breakfast \n10:00 – 11:00 am\nSpeaker: Matt Kerr\, Washington University in St. Louis\nTitle: Hypergeometric families and Beilinson’s conjectures\nAbstract: I will describe the construction of motivic cohomology classes on hypergeometric families of Calabi-Yau 3-folds using Hadamard convolutions. These are analogous to elements of the Mordell-Weil group for families of elliptic curves\, and produce solutions to certain inhomogeneous Picard-Fuchs equations. This is part of a joint project with Vasily Golyshev in which we numerically verify Beilinson’s conjectures in some new cases. \n12:00 – 1:00: Lunch \n1:00 – 2:00 pm\nSpeaker: Fenglong You\, University of Nottingham & ETH Zurich\nTitle: Theta functions in mirror symmetry\nAbstract: To obtain a mirror of a Calabi—Yau manifold using Gross—Siebert’s intrinsic mirror symmetry\, one considers a maximally unipotent monodromy degeneration of the Calabi—Yau and take proj of the degree zero part of a relative quantum cohomology ring associated with the degeneration. Theta functions form a canonical basis of the degree zero part of the relative quantum cohomology ring. Theta functions can also be defined in terms of punctured invariants of the broken line type. I will explain a variant of intrinsic mirror symmetry using orbifold invariants\, theta functions for general snc pairs and a relation with the DHT conjecture. \n3:00 – 4:00 pm\nSpeaker: Mohsen Karkheiran\, University of Alberta\nTitle: Emergence of Heterotic-Type II duality from DHT conjecture\nAbstract: The duality between Heterotic and Type IIA strings was conjectured in mid-90’s based on the properties of 4D N=2 field theories and solitonic strings in 6D. Here\, we show that this duality can also emerge from the DHT conjecture. We assume both IIA and IIB strings are compactified over toric Calabi-Yau threefolds which admit K3-fibrations with arbitrary polarizations. Then by applying the Hori-Vafa mirror symmetry to the “pieces” of these Calabi-Yau manifolds\, we will be able to derive the defining data for Heterotic strings. This approach works for any gauge group on the Heterotic side\, and we will show how it can be practically useful to derive the Heterotic dual for any toric Calabi-Yau threefolds in Type IIA or F-theory. \n4:00 – 4:30 pm: Coffee/Tea \n  \nWednesday\, June 26\, 2024 \n9:30 – 10:00 am: Breakfast \n10:00 – 11:00 am\nSpeaker: Thorsten Schimannek\, Utrecht University\nTitle: Enumerative geometry and modularity in two-modulus K3-fibered Calabi-Yau threefolds\nAbstract: Smooth M_m-polarized K3-fibered Calabi-Yau (CY) 3-folds have been classified in [DHNT] and [KT] in terms of the choice of a generalized functional invariant (GFI) and\, in the case m=1\, a generalized homological invariant (GHI). The resulting geometries generally exhibit a small number of complex structure moduli greater or equal to two. I will start my talk by discussing a concrete choice of these invariants that realizes (almost all of) the geometries with exactly two moduli and describe the structure of the corresponding moduli spaces. The corresponding variations of Hodge structure are entirely determined by the regular periods\, for which we obtain a generic expression in terms of m and three integers i\,j\,s. Using the form of this period and Batyrev-Borisov mirror symmetry I will then explicitly construct the corresponding mirror CY 3-folds with two Kaehler moduli and show consistency with the DHT conjecture. In the cases with s=0\, the mirror CY 3-folds are again K3-fibered but with a 2m-polarization. The generic form of the periods allows us to derive generic modular expressions for the A-model topological string free energies and we argue that those are a consequence of a Tyurin degeneration of the GFI with the central fiber being an M_m-polarized K3.\nThe talk is based on work in progress with Charles Doran and Boris Pioline. \n12:00 – 1:00: Lunch \n1:00 – 2:00 pm\nSpeaker: Michael Schultz\, Virginia Tech\nTitle: Mirror Symmetry from Irrationality Proofs and a Proposal for Local Invariants\nAbstract: While Apéry’s original proof of the irrationality of ζ(3) stunned the mathematics community in 1978\, subsequent generations of mathematicians (including a number of those at this workshop) have discovered geometric and modular structures underlying these irrationality proofs that are arguably even more striking. One such well known example are connections to modular pencils of elliptic curves and K3 surfaces and their Picard-Fuchs operators\, which exhibit maximally unipotent monodromy. These objects are respectively mirror dual to anticanonical divisors in certain del Pezzo surfaces and Fano threefolds\, and their Picard-Fuchs operators to the A-side connection on small quantum cohomology for these varieties. Although the Yukawa couplings calculated in classical mirror symmetry for elliptic curves and K3 surfaces are trivial\, I will show in this talk how a blend of the perspectives above allows one to define “virtual” Yukawa couplings for these families that are not trivial. It will be proposed that the utility of this perspective is in computing local invariants related to the mirror\, which recovers some known results in the literature and utilizes connections to work on the DHT conjecture and the twist construction of Doran & Malmendier. \n3:00 – 4:00 pm\nSpeaker: Jesse Huang\, University of Alberta\nTitle: An invitation to global toric mirror symmetry \n4:00 – 4:30 pm: Coffee/Tea \n  \n \n\n 
URL:https://cmsa.fas.harvard.edu/event/fibration/
LOCATION:20 Garden Street\, Cambridge\, MA 02138\, MA\, MA\, 02138\, United States
CATEGORIES:Workshop
ATTACH;FMTTYPE=image/png:https://cmsa.fas.harvard.edu/media/calabi-yau-manifold-1.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20210503T100000
DTEND;TZID=America/New_York:20210503T160000
DTSTAMP:20260501T123915
CREATED:20230707T172813Z
LAST-MODIFIED:20240103T100239Z
UID:10000914-1620036000-1620057600@cmsa.fas.harvard.edu
SUMMARY:Computational Biology Symposium
DESCRIPTION:On May 3\, 2021 the CMSA will be hosting a Computational Biology Symposium virtually on Zoom. This symposium will be organized by Vijay Kuchroo. \nThe symposium will begin at 10:00am ET. There will be a morning and afternoon session\, with an hour break for lunch. \nVideos of the talks can be found in this Youtube playlist. Links are also available in the schedule below.\nConfirmed participants: \n\nUri Alon\, Weizmann Institute\nElana Fertig\, Johns Hopkins\nMartin Hemberg\, Brigham and Women’s Hospital\nPeter Kharchenko\, Harvard University\nSmita Krishnaswamy\, Yale University\nJohn Marioni\, EMBL-EBI\nEran Segal\, Weizmann Institute\nMeromit Singer\, Harvard Medical School\n\nSchedule:\nPDF of the schedule    Download
URL:https://cmsa.fas.harvard.edu/event/computational-biology-symposium/
LOCATION:20 Garden Street\, Cambridge\, MA 02138\, MA\, MA\, 02138\, United States
CATEGORIES:Event
ATTACH;FMTTYPE=image/png:https://cmsa.fas.harvard.edu/media/Compbiotextlessfeature-600x338-1.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20170605T090000
DTEND;TZID=America/New_York:20170606T170000
DTSTAMP:20260501T123915
CREATED:20230717T175551Z
LAST-MODIFIED:20250305T182141Z
UID:10000032-1496653200-1496768400@cmsa.fas.harvard.edu
SUMMARY:A Celebration of Symplectic Geometry: 15 Years of JSG
DESCRIPTION:In celebration of the Journal of Symplectic Geometry’s 15th anniversary\, the Center of Mathematical Sciences and Applications will be hosting A Celebration of Symplectic Geometry: 15 Years of JSG on June 5-6\, 2017. \nConfirmed speakers: \n\nRoger Casals\, MIT\nChen He\, Northeastern University\nYael Karshon\, University of Toronto\nAilsa Keating\, Institute of Advanced Study\nEckhard Meinrenken\, University of Toronto\nAna Rita Pires\, Fordham University\nSobhan Seyfaddini\, Institute of Advanced Study\nAlejandro Uribe\, University of Michigan\nJonathan Weitsman\, Northeastern University\n\nThe conference is co-organized by Denis Auroux and Victor Guillemin. Additional information on the conference will be announced closer to the event. \nSchedule:\nJune 5\, Monday (Full day)\n\n\n\nTime\nSpeaker\nTopic\n\n\n8:30am – 9:0am\n\nBreakfast\n\n\n9:00am – 10:00am\nJonathan Weitsman\nTitle: On the geometric quantization of (some) Poisson manifolds\n\n\n10:30am – 11:30am\nEckhard Meinrenken\nTitle: On Hamiltonian loop group spaces \nAbstract: Let G be a compact Lie group. We explain a construction of an LG-equivariant spinor module over any Hamiltonian loop group space with proper moment map. It may be regarded as its `canonical spin-c structure’. We show how to reduce to finite dimensions\, resulting in actual spin-s structure on transversals\, as well as twisted spin-c structures for the associated quasi-hamiltonian space. This is based on joint work with Yiannis Loizides and Yanli Song.\n\n\n\n11:30am – 1:30pm\n\nBreak\n\n\n1:30pm – 2:30pm\nAna Rita Pires\nTitle: Infinite staircases in symplectic embedding problems \nAbstract: McDuff and Schlenk studied an embedding capacity function\, which describes when a 4-dimensional ellipsoid can symplectically embed into a 4-ball. The graph of this function includes an infinite staircase related to the odd index Fibonacci numbers. Infinite staircases have been shown to exist also in the graphs of the embedding capacity functions when the target manifold is a polydisk or the ellipsoid E(2\,3). I will describe how we use ECH capacities\, lattice point counts and Ehrhart theory to show that infinite staircases exist for these and a few other target manifolds\, as well as to conjecture that these are the only such target manifolds. This is a joint work with Cristofaro-Gardiner\, Holm and Mandini. \nVideo\n\n\n3:00pm – 4:00pm\nSobhan Seyfaddini\nTitle: Rigidity of conjugacy classes in groups of area-preserving homeomorphisms \nAbstract: Motivated by understanding the algebraic structure of groups of area-preserving homeomorphims F. Beguin\, S. Crvoisier\, and F. Le Roux were lead to the following question: Can the conjugacy class of a Hamiltonian homeomorphism be dense? We will show that one can rule out existence of dense conjugacy classes by simply counting fixed points. This is joint work with Le Roux and Viterbo.\n\n\n4:30pm – 5:30pm\nRoger Casals\nTitle: Differential Algebra of Cubic Graphs\nAbstract: In this talk we will associate a combinatorial dg-algebra to a cubic planar graph. This algebra is defined by counting binary sequences\, which we introduce\, and we shall provide explicit computations and examples. From there we study the Legendrian surfaces behind these constructions\, including Legendrian surgeries\, the count of Morse flow trees involved in contact homology\, and the relation to microlocal sheaves. Time permitting\, I will explain a connection to spectral networks.Video\n\n\n\nJune 6\, Tuesday (Full day) \n\n\n\nTime\nSpeaker\nTopic\n\n\n8:30am – 9:00am\n\nBreakfast\n\n\n9:00am – 10:00am\nAlejandro Uribe\nTitle: Semi-classical wave functions associated with isotropic submanifolds of phase space \nAbstract: After reviewing fundamental ideas on the quantum-classical correspondence\, I will describe how to associate spaces of semi-classical wave functions to isotropic submanifolds of phase space satisfying a Bohr-Sommerfeld condition. Such functions have symbols that are symplectic spinors\, and they satisfy a symbol calculus under the action of quantum observables. This is the semi-classical version of the Hermite distributions of Boutet the Monvel and Guillemin\, and it is joint work with Victor Guillemin and Zuoqin Wang. I will inlcude applications and open questions. \nVideo\n\n\n10:30am – 11:30am\nAlisa Keating\nTitle: Symplectomorphisms of exotic discs \nAbstract: It is a theorem of Gromov that the group of compactly supported symplectomorphisms of R^4\, equipped with the standard symplectic form\, is contractible. While nothing is known in higher dimensions for the standard symplectic form\, we show that for some exotic symplectic forms on R^{4n}\, for all but finitely n\, there exist compactly supported symplectomorphisms that are smoothly non-trivial. The principal ingredients are constructions of Milnor and Munkres\, a symplectic and contact version of the Gromoll filtration\, and Borman\, Eliashberg and Murphy’s work on existence of over-twisted contact structures. Joint work with Roger Casals and Ivan Smith. \nVideo\n\n\n11:30am – 1:30pm\n\nBreak\n\n\n1:30pm – 2:30pm\nChen He\nTitle: Morse theory on b-symplectic manifolds \nAbstract: b-symplectic (or log-symplectic) manifolds are Poisson manifolds equipped with symplectic forms of logarithmic singularity. Following Guillemin\, Miranda\, Pires and Scott’s introduction of Hamiltonian group actions on b-symplectic manifolds\, we will survey those classical results of Hamiltonian geometry to the b-symplectic case. \nVideo\n\n\n3:00pm – 4:00pm\nYael Karshon\nTitle: Geometric quantization with metaplectic-c structures \nAbstract: I will present a variant of the Kostant-Souriau geometric quantization procedure that uses metaplectic-c structures to incorporate the “half form correction” into the prequantization stage. This goes back to the late 1970s but it is not widely known and it has the potential to generalize and improve upon recent works on geometric quantization. \nVideo\n\n\n\n 
URL:https://cmsa.fas.harvard.edu/event/a-celebration-of-symplectic-geometry-15-years-of-jsg-june-5-6-2017/
LOCATION:20 Garden Street\, Cambridge\, MA 02138\, MA\, MA\, 02138\, United States
CATEGORIES:Conference,Event
ATTACH;FMTTYPE=image/png:https://cmsa.fas.harvard.edu/media/Shlomo_orange.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20170501T090000
DTEND;TZID=America/New_York:20170502T170000
DTSTAMP:20260501T123915
CREATED:20230717T175324Z
LAST-MODIFIED:20240209T152357Z
UID:10000031-1493629200-1493744400@cmsa.fas.harvard.edu
SUMMARY:Working Conference on Covariance Analysis in Biology\, May 1-4\, 2017
DESCRIPTION:The Center of Mathematical Sciences and Applications will be hosting a working Conference on Covariance Analysis in Biology\, May 1-4\, 2017.  The conference will be hosted in Room G10 of the CMSA Building located at 20 Garden Street\, Cambridge\, MA 02138. \nThis event is open and free.  If you would like to attend\, please register here to help us keep a headcount. A list of lodging options convenient to the Center can also be found on our recommended lodgings page. \nSpeakers: \nOrr Ashenberg\, Fred Hutchinson Cancer Research Center \nJohn Barton\, Massachusetts Institute of Technology \nSimona Cocco\, Laboratoire de Physique Statistique de l’ENS \nSean Eddy\, Harvard University \nEfthimios Kaxiras\, Harvard University \n\n\n\nMichael Laub\, Massachusetts Institute of Technology \nDebora S. Marks\, Harvard University \n\n\n\nGovind Menon\, Brown University \nRémi Monasson\, Laboratoire de Physique Théorique de l’ENS \nAndrew Murray\, Harvard University \nIlya Nemenman\, Emory College \n\n\n\nChris Sander\, Dana-Farber Cancer Institute\, Harvard Medical School \n\n\n\nDave Thirumalai\, University of Texas at Austin \nMartin Weigt\, IBPS\, Université Pierre et Marie Curie \nMatthieu Wyart\, EPFL \nMore speakers will be confirmed soon. \n  \n\n\n\nSchedule:\n(Please click here for a downloadable version of the schedule.)\nPlease note that the schedule for both days is currently tentative and is subject to change.\nMay 1\, Monday \n\n\n\n\n\nTime\nSpeaker\nTopic\n\n\n9:00-10:00am\nSean Eddy\nTBA\n\n\n10:00-11:00am\nMike Laub\nTBA\n\n\n11:00am-12:00pm\nIlya Nemenman\nTBA\n\n\n\n\nMay 2\, Tuesday\n\n\n\n\n\nTime\nSpeaker\nTopic\n\n\n9:00-10:00am\nOrr Ashenberg\nTBA\n\n\n10:00-11:00am\nDebora Marks\nTBA\n\n\n11:00am-12:00pm\nMartin Weigt\nTBA\n\n\n4:30pm-5:30pm\nSimona Cocco\nCMSA Colloquia\n\n\n\n  \n\nMay 3\, Wednesday\n\n\n\n\n\nTime\nSpeaker\nTopic\n\n\n9:00-10:00am\nAndrew Murray\nTBA\n\n\n10:00-11:00am\nMatthieu Wyart\nTBA\n\n\n11:00am-12:00pm\nRémi Monasson\nTBA\n\n\n\n  \n\nMay 4\, Thursday\n\n\n\n\nTime\nSpeaker\nTopic\n\n\n9:00-10:00am\nDavid Thirumalai\nTBA\n\n\n10:00-11:00am\nChris Sander\nTBA\n\n\n11:00am-12:00pm\nJohn Barton\nTBA\n\n\n\n  \n\n\nOrganizers: \n\n\n\nMichael Brenner\, Lucy Colwell\, Elena Rivas\, Eugene Shakhnovich \n\n\n\n* This event is sponsored by CMSA Harvard University. \n\n\n\n\nPast Events
URL:https://cmsa.fas.harvard.edu/event/working-conference-on-covariance-analysis-in-biology-may-1-4-2017/
LOCATION:20 Garden Street\, Cambridge\, MA 02138\, MA\, MA\, 02138\, United States
CATEGORIES:Conference,Event
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BEGIN:VEVENT
DTSTART;TZID=America/New_York:20170423T090000
DTEND;TZID=America/New_York:20170424T170000
DTSTAMP:20260501T123915
CREATED:20230717T174601Z
LAST-MODIFIED:20250304T181313Z
UID:10000028-1492938000-1493053200@cmsa.fas.harvard.edu
SUMMARY:Workshop on Quantum Information
DESCRIPTION:The Center of Mathematical Sciences and Applications will be hosting a workshop on Quantum Information on April 23-24\, 2018. In the days leading up to the conference\, the American Mathematical Society will also be hosting a sectional meeting on quantum information on April 21-22. You can find more information here. \nThe following speakers are confirmed: \n\nFernando G.S.L Brandão (CalTech)\nJacob Biamonte (Skoltech)\nIsaac Chuang (MIT)\nIris Cong (Harvard)\nAram Harrow (MIT)\nKe Li (HIT)\nMikhail D. Lukin (Harvard)\nShunlong Luo (AMSS)\nRenato Renner (ETH Zürich)\nPeter Shor (MIT)
URL:https://cmsa.fas.harvard.edu/event/workshop-on-quantum-information/
LOCATION:20 Garden Street\, Cambridge\, MA 02138\, MA\, MA\, 02138\, United States
CATEGORIES:Event,Workshop
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20160201
DTEND;VALUE=DATE:20161231
DTSTAMP:20260501T123915
CREATED:20230904T081643Z
LAST-MODIFIED:20250328T145717Z
UID:10000052-1454284800-1483142399@cmsa.fas.harvard.edu
SUMMARY:Nonlinear Equations Program
DESCRIPTION:  \nMost physical phenomena\, from the gravitating universe to fluid dynamics\, are modeled on nonlinear differential equations. The subject also makes close connections with other branches of mathematics. In particular\, some of the deepest results in complex geometry and topology were obtained through solutions of nonlinear equations. \nThe subject underwent rapid developments in the last century and foundational results were established. Compared to linear equations\, the difficulty of solving nonlinear equations is of a different order of magnitude and the methods employed in solving them are also much more diversified. To this date\, it is an active field with recent exciting discoveries and renewed interests\, and several long standing problems seem to be within reach. The special year aims to spur activity in this subject\, to provide a natural setting for the most cutting edge results to be communicated\, and to facilitate interaction among researchers of different backgrounds. \nDuring the year\, there will be two weekly seminar programs.  Each program participants will be asked to give a talk on geometric analysis\, or the evolution of equations\, hyperbolic equations\, and fluid dynamics.    \nSeminar on Geometric Analysis \nSeminar on Evolution Equations \nSeminar on General Relativity \nConcluding Conference on Nonlinear Equations Program \nMini-School on Nonlinear Equations\, Dec. 2016 \nHere is a partial list of the mathematicians who have indicated that they will attend part or all of this special program \n\n\n\n\n\n\nName\nHome Institution\nTentative Visiting Dates\n\n\n\n\nStefano Bianchini\nSISSA\n04/01/2016 – 05/31/2016\n\n\nLydia Bieri\nUniversity of Michigan\n02/01/2016 – 04/30/2016\n\n\nAlbert Chau\nUniversity of British Columbia\n02/26/2016 – 05/26/2016\n\n\nBinglong Chen\nSun Yat-sen University\n09/01/2015 – 11/30/2015\n\n\nQingtao Chen\nETHZ (Swiss Federal Institute of Technology in Zurich)\n03/17/2016 – 04/04/2016\n\n\nPiotr Chrusciel\nUniversity of Vienna\n03/01/2016 – 05/30/2016\n\n\nFernando Coda Marques\nPrinceton University\n04/25/2016 – 04/29/2016 05/23/2016 – 05/27/2016\n\n\nMihalis Dafermos\nPrinceton University\n04/01/2016 – 04/30/2016\n\n\nCamillo De Lellis\nUniversity of Zurich\n02/01/2016 – 4/30/2016\n\n\nMichael Eichmair\nUniversity of Vienna\n03/21/2016 – 04/01/2016\n\n\nFelix Finster\nUniversitat Regensburg\n09/20/2015 – 10/20/2015 03/20/2016 – 04/20/2016\n\n\nXianfeng David Gu\nSUNY at Stony Brook\n04/01/2016 – 04/30/2016\n\n\nZheng-Cheng Gu\nPerimeter Institute for Theoretical Physics\n08/15/2015 – 09/15/2015\n\n\nPengfei Guan\nMcGill University\n10/10/2015 – 10/17/2015\n\n\nXiaoli Han\nTsinghua University\n01/20/2016 – 04/19/2016\n\n\nThomas Hou\nCalifornia Institute of Technology\n11/01/2016 – 11/30/2016\n\n\nFeimin Huang\nChinese Academy of Sciences\n02/15/2016 – 04/15/2016\n\n\nXiangdi Huang\nChinese Academy of Sciences\n09/10/2015 – 12/10/2015\n\n\nTom Ilmanen\nETH Zurich\n10/19/2015 – 12/18/2015\n\n\nNiky Kamran\nMcGill Univeristy\n04/04/2016 – 04/08/2016\n\n\nNicolai Krylov\nUniversity of Minnesota\n11/01/2015 – 11/30/2015\n\n\nJunbin Li\nSun Yat-sen University\n02/01/2016 – 04/30/2016\n\n\nYong Lin\nRenmin University of China\n02/01/2016 – 03/31/2016\n\n\nAndre Neves\nImperial College London\n4/25/2016 – 4/29/2016; 5/23/2016 – 5/27/2016\n\n\nDuong H. Phong\nColumbia University\n04/08/2016 – 04/10/2016\n\n\nOvidiu Savin\nColumbia University\n10/15/2015 – 12/14/2015\n\n\nRichard Schoen\nStanford University\n03/21/2016 – 03/25/2016\n\n\nMao Sheng\nUniversity of Science and Technology of China\n01/15/2016 – 01/28/2016\n\n\nValentino Tosatti\nNorthwestern University\n02/01/2016 – 04/15/2016\n\n\nJohn Toth\nMcGill University\n04/04/2016 – 04/08/2016\n\n\nChung-Jun Tsai\nNational Taiwan University\n05/01/2016 – 05/08/2016\n\n\nTai-Peng Tsai\nUniversity of British Columbia\n03/20/2016 – 05/31/2016\n\n\nLi-Sheng Tseng\nUC Irvine\n02/08/2016 – 02/19/2016; 04/27/2016 – 05/11/2016\n\n\nChun Peng Wang\nJilin University\n02/01/2016 – 04/30/2016\n\n\nXu-Jia Wang\nAustralian National University\n04/01/2016 – 05/31/2016\n\n\nBen Weinkove\nNorthwestern University\n02/28/2016 – 03/18/2016\n\n\nSijue Wu\nUniversity of Michigan\n04/01/2016 – 04/30/2016\n\n\nChunjing Xie\nShanghai Jiao Tong University\n09/08/2015 – 12/07/2015\n\n\nZhou Ping Xin\nThe Chinese University of Hong Kong\n10/01/2015 – 11/30/2015\n\n\nHongwei Xu\nZhejiang University\n09/01/2015 – 11/30/2015\n\n\nPeng Ye\nUniversity of Illinois at Urbana-Champaign\n11/15/2015 – 11/22/2015\n\n\nPin Yu\nTshinghua University\n09/07/2015 – 12/10/2015\n\n\nYi Zhang\nFudan University\n01/18/2016 – 05/31/2016
URL:https://cmsa.fas.harvard.edu/event/nonlinear-equations-program/
LOCATION:20 Garden Street\, Cambridge\, MA 02138\, MA\, MA\, 02138\, United States
CATEGORIES:Event,Programs
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20151029T090000
DTEND;TZID=America/New_York:20151030T170000
DTSTAMP:20260501T123915
CREATED:20230717T180326Z
LAST-MODIFIED:20250304T180538Z
UID:10000014-1446109200-1446224400@cmsa.fas.harvard.edu
SUMMARY:Second Annual STAR Lab Conference
DESCRIPTION:The second annual STAR Lab conference is running 10/29/-10/30/2015 at the Harvard Business School.  This event is co-sponsored by the Center of Mathematical Sciences and Applications. \nFor more information\, please consult the event’s website.
URL:https://cmsa.fas.harvard.edu/event/second-annual-star-lab-conference-2/
LOCATION:20 Garden Street\, Cambridge\, MA 02138\, MA\, MA\, 02138\, United States
CATEGORIES:Conference,Event
END:VEVENT
END:VCALENDAR