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General Relativity Seminar Speaker: Zihan Yan, Cambridge University Title: Linearised Second Law for Higher Curvature Gravity and Non-Minimally Coupled Vector Fields Abstract: Expanding the work of arXiv:1504.08040, we show that black holes obey a second law for linear perturbations to bifurcate Killing horizons, in any covariant higher curvature gravity coupled to scalar and vector fields. The vector […] |
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Algebraic Geometry in String Theory Seminar Speaker: Jonathan Rosenberg, University of Maryland Title: Derived categories of genus one curves and torsors over abelian varieties Abstract: Studying orientifold string theories on elliptic curves or abelian varieties motivates studying the derived category of coherent sheaves on a genus one curve or a torsor over an abelian variety over the […]
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Active Matter Seminar Speaker: Abby Plummer, Boston University Title: Shape morphing with swelling hydrogels and expanding foams Abstract: Materials that increase in size offer intriguing possibilities for shape-morphing applications. Here, we explore two such systems—swelling polyacrylamide hydrogels and expanding polyurethane foams. The hydrogels swell by absorbing water into crosslinked polymer networks. They can therefore be […] |
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CURRENT DEVELOPMENTS IN MATHEMATICS 2024 APRIL 5-6, 2024 HARVARD UNIVERSITY SCIENCE CENTER LECTURE HALL C https://www.math.harvard.edu/event/current-developments-in-mathematics-2024/ Speakers: Daniel Cristofaro-Gardiner - University of Maryland Samit Dasgupta - Duke University Jiaoyang Huang - University of Pennsylvania Daniel Litt - University of Toronto Lisa Piccirillo - MIT/University of Texas Download PDF for a detailed schedule of lectures […] 
Quantum Matter in Mathematics and Physics Seminar Speaker: Henry Cohn (MIT and Microsoft) Title: Discrete geometry and the modular bootstrap Abstract: In this talk, I'll discuss the remarkable connections between the modular bootstrap and sphere packing or ground state problems discovered by Hartman, Mazáč, and Rastelli in 2019, with a focus on opportunities for further […] 
CMSA Member Seminar Speaker: Farzan Vafa Title: Phase diagram and confining strings in a minimal model of nematopolar matter Abstract: We investigate a minimal model of a nematopolar system. We analytically uncover a phase diagram consisting of a locked phase where the polar order and nematic order are locked, and unlocked phases which could be […] |
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Algebraic Geometry in String Theory Seminar Speaker: Alan Thompson (Loughborough University) Title: Mirror symmetry for fibrations and degenerations of K3 surfaces Abstract: In 2016, Doran, Harder, and I conjectured a mirror symmetric relationship between Tyurin degenerations and splittings of codimension 1 fibrations on Calabi-Yau manifolds. In this talk I will discuss recent work to make this […] |
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CMSA Member Seminar Speaker: Puskar Mondal Title: Global weak solutions of 3+1 dimensional vacuum Einstein equations Abstract: It is important to understand if the `solutions' of non-linear evolutionary PDEs persist for all time or become extinct in finite time through the blow-up of invariant entities. Now the question of this global existence or finite time […] |
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Mathematical Aspects of Scattering Amplitudes Program Dates: April 15 - May 24, 2024 Location: Harvard CMSA, 20 Garden Street, Cambridge, MA 02138 This program will bring together and foster interaction between theoretical physicists and mathematicians working on various topics connected to recent developments in our understanding of scattering amplitudes in quantum field theory. The field […] |
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General Relativity Seminar Speaker: Xiaoyi Liu, UCSB Title: New Well-Posed Boundary Conditions for Semi-Classical Euclidean Gravity Abstract: We consider four-dimensional Euclidean gravity in a finite cavity. We point out that there exists a one-parameter family of boundary conditions, parameterized by a real constant, where a suitably Weyl-rescaled boundary metric is fixed, and all give a […] CMSA Q and A Seminar Speaker: Cengiz Pehlevan, Harvard Question: What is feature learning?
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Mathematical Aspects of Scattering Amplitudes Lecture Speaker: Sabrina Pasterski, Perimeter Institute Title: Radiation in Holography |
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Algebraic Geometry in String Theory Seminar Speaker: Aaron Landesman, MIT Title: Geometric local systems on very general curves Abstract: What is the smallest genus h of a non-isotrivial curve over the generic genus g curve? In joint work with Daniel Litt, we show h is more than $\sqrt{g}$ by proving amore general result about variations of […] |
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Quantum Matter in Mathematics and Physics Seminar Speaker: Chetan Nayak, Microsoft and UCSB Title: Fusion Rule Measurement in a Topological Qubit 
CMSA Member Seminar Speaker: Sunghyuk Park, Harvard CMSA Title: 3D quantum trace map Abstract: I will speak about my recent work (joint with Sam Panitch) constructing the 3d quantum trace map, a homomorphism from the Kauffman bracket skein module of an ideally triangulated 3-manifold to its (square root) quantum gluing module, thereby giving a precise relationship […] |
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General Relativity Seminar Speaker: Chris Fewster, York University Title: Quantum Energy Inequalities Abstract: Many theorems of mathematical relativity, including singularity and positive mass theorems, include the classical energy conditions among their hypotheses. However, matter described by quantum field theory can violate the classical energy conditions and indeed there is no lower bound to the energy […] CMSA Q and A Seminar Speaker: Melanie Weber, Harvard Question: What is the Ricci curvature of a graph? |
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Algebraic Geometry in String Theory Seminar Speaker: Alessandro Chiodo, IMJ-Paris Rive Gauche (Jussieu) Title: The logarithmic double ramification locus Abstract: Given a family of smooth curves C -> S with a line bundle L on C, it is natural to study the locus of points x in S where L_x is trivial on C_x. When the family […]
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Mathematical Aspects of Scattering Amplitudes Lecture Speaker: Tomasz Taylor, Northeastern University Title: Progress in Yang-Mills-Liouville Theory |
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Quantum Matter in Mathematics and Physics Seminar Speaker: Jesse Thaler, MIT Title: What Observables are Safe to Calculate? Abstract: In collider physics, perturbative quantum field theory is the workhorse framework for computing theoretical predictions to compare to experimental measurements. An observable is called "safe" if its cross section can be predicted order-by-order in perturbation theory […] |
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The CMSA will be hosting a Workshop on Global Categorical Symmetries from April 29–May 3, 2024. Participation in the workshop is by invitation. The workshop will hold three Symmetry Colloquia open to the community on Thursday, May 2, 2024. Location: Room G-10, CMSA, 20 Garden Street, Cambridge MA 02138 Time: 2:00 - 2:50 pm Speaker: Clay […] 
Colloquium Speaker: Lance Dixon (SLAC, Stanford University) Title: The DNA of Particle Scattering Abstract: At the Large Hadron Collider, the copious scattering of quarks and gluons in quantum chromodynamics (QCD) produces Higgs bosons and many backgrounds to searches for new physics. At short distances, scattering in QCD can be evaluated in perturbation theory and leads to highly […] |
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Mathematical Aspects of Scattering Amplitudes Lecture Speaker: Nima Arkani-Hamed, IAS Title: Surfaceology and the Real World Part 1 (Note change of venue to Jefferson 453) Speaker: Lakshminarayanan Mahadevan Question: What is morphogenesis? (Morphogenesis: geometry and biology)
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Mathematical Aspects of Scattering Amplitudes Lecture Speaker: Nima Arkani-Hamed, IAS Title: Surfaceology and the Real World Part 2 (Note change of venue to Jefferson 453) |
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Mathematical Aspects of Scattering Amplitudes Lecture Speaker: Jaroslav Trnka, University of California, Davis Title: Loops of loops expansion in the Amplituhedron
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Mathematical Aspects of Scattering Amplitudes Lecture Speaker: Yu-tin Huang, National Taiwan University Title: Loop in trees: Chambers in amplitudes and correlation functions
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Mathematical Aspects of Scattering Amplitudes Lecture Speaker: Livia Ferro, University of Hertfordshire Title: Scattering Amplitudes from Null-cone Geometry |
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Mathematical Aspects of Scattering Amplitudes Lecture Speaker: Daniil Rudenko, U Chicago Title: Introduction to Cluster Polylogarithms Location: Harvard Science Center 310
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Active Matter Seminar Speaker: Jayson Paulose, University of Oregon Title: Control of parametric amplification in space-time modulated mechanical metamaterials Abstract: Active mechanical metamaterials harbor acoustic signal processing functionalities that are impossible to achieve in passive structures. Amplifying an elastic wave as it passes through the material is a prominent example, with potential applications in acoustic signal […]
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Symmetry Colloquia - Global Categorical Symmetries May 2, 2024 Location: Room G-10, CMSA, 20 Garden Street, Cambridge MA 02138 Speaker: Clay Còrdova, University of Chicago Title: Particle-Soliton Degeneracies from Spontaneously Broken Non-Invertible Symmetry Abstract: We study non-invertible topological symmetry operators in massive quantum field theories in (1+1) dimensions. In phases where this symmetry is spontaneously broken […] |
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Mathematical Aspects of Scattering Amplitudes Lecture Speaker: Andrew McLeod, Edinburgh Title: Genealogical Constraints on Feynman Integrals |