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DTSTART;TZID=America/New_York:20260127T161500
DTEND;TZID=America/New_York:20260127T183000
DTSTAMP:20260501T112450
CREATED:20250407T174204Z
LAST-MODIFIED:20260126T163039Z
UID:10003739-1769530500-1769538600@cmsa.fas.harvard.edu
SUMMARY:The Quasi-Adiabatic Theorem and All That
DESCRIPTION:Geometry and Quantum Theory Seminar \nSpeaker: Daniel Spiegel\, Harvard \nTitle: The Quasi-Adiabatic Theorem and All That \nAbstract: Yosuke Kubota has recently made progress on understanding Kitaev’s conjecture by constructing a loop spectrum consisting of spaces of quantum spin systems\, indexed by spatial dimension of the lattice (arXiv: 2503.12618). After a brief reminder on the C*-algebraic formalism of quantum spin systems\, I will discuss Section 2 of this paper\, which covers some of the more analytical tools used to construct the loop spectrum. In particular\, I will focus on the quasi-adiabatic theorem which roughly speaking states that a smooth path of gapped Hamiltonians with unique ground states gives rise to a path of nice automorphisms that map the ground state at time zero to the path of ground states.
URL:https://cmsa.fas.harvard.edu/event/quantumgeo_12726/
LOCATION:Science Center 507\, 1 Oxford Street\, Cambridge\, 02138
CATEGORIES:Geometry and Quantum Theory Seminar
ATTACH;FMTTYPE=image/png:https://cmsa.fas.harvard.edu/media/CMSA-Geometry-Quantum-Theory-1.27.26-scaled.png
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BEGIN:VEVENT
DTSTART;TZID=America/New_York:20260128T160000
DTEND;TZID=America/New_York:20260128T173000
DTSTAMP:20260501T112450
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
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BEGIN:VEVENT
DTSTART;TZID=America/New_York:20260129T133000
DTEND;TZID=America/New_York:20260129T143000
DTSTAMP:20260501T112450
CREATED:20251223T195721Z
LAST-MODIFIED:20260122T171100Z
UID:10003860-1769693400-1769697000@cmsa.fas.harvard.edu
SUMMARY:Complete Calabi-Yau Metrics and Optimal Transport
DESCRIPTION:Differential Geometry and Physics Seminar \nSpeaker: Tristan Collins\, University of Toronto \nTitle: Complete Calabi-Yau Metrics and Optimal Transport \nAbstract: I will discuss the connection between optimal transport and the existence of complete Calabi-Yau metrics on log Calabi-Yau varieties.  I will explain how the geometric problem of constructing complete Calabi-Yau metrics gives rise to problems in the boundary regularity theory for optimal transport\, and how ideas from geometry can be used to make progress on some of these problems.  This talk will survey joint works with Li\, Tong\, Tong-Yau\, Firester\, and Tong-Firester.
URL:https://cmsa.fas.harvard.edu/event/dgphys_12926/
LOCATION:CMSA Room G10\, CMSA\, 20 Garden Street\, Cambridge\, MA\, 02138\, United States
CATEGORIES:Differential Geometry and Physics Seminar
ATTACH;FMTTYPE=image/png:https://cmsa.fas.harvard.edu/media/DG-Physics-Seminar-1.29.26-scaled.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20260129T160000
DTEND;TZID=America/New_York:20260129T170000
DTSTAMP:20260501T112450
CREATED:20250911T184647Z
LAST-MODIFIED:20251223T202516Z
UID:10003792-1769702400-1769706000@cmsa.fas.harvard.edu
SUMMARY:Algebra Seminar
DESCRIPTION:Algebra Seminar \n 
URL:https://cmsa.fas.harvard.edu/event/algebra-seminar_12926/
LOCATION:CMSA Room G10\, CMSA\, 20 Garden Street\, Cambridge\, MA\, 02138\, United States
CATEGORIES:Algebra Seminar
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BEGIN:VEVENT
DTSTART;TZID=America/New_York:20260130T120000
DTEND;TZID=America/New_York:20260130T130000
DTSTAMP:20260501T112450
CREATED:20251014T142709Z
LAST-MODIFIED:20260128T171404Z
UID:10003811-1769774400-1769778000@cmsa.fas.harvard.edu
SUMMARY:Some results about saturation
DESCRIPTION:Member Seminar \nSpeaker: Stephen Landsittel \nTitle: Some results about saturation \nAbstract: Given a local ring R we can ask when saturation of ideals in R commutes with other operations on ideals (such as extension to a ring containing R). We show that the condition that extension of ideals along a ring map R \to S commutes with saturation controls inherent properties of the rings R & S\, such as Cohen-Macaulayness and unramifiedness.
URL:https://cmsa.fas.harvard.edu/event/member-seminar-13026/
LOCATION:Common Room\, CMSA\, 20 Garden Street\, Cambridge\, MA\, 02138\, United States
CATEGORIES:Member Seminar
ATTACH;FMTTYPE=image/png:https://cmsa.fas.harvard.edu/media/CMSA-Member-Seminar-1.30.26.docx-1-scaled.png
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BEGIN:VEVENT
DTSTART;TZID=America/New_York:20260130T133000
DTEND;TZID=America/New_York:20260130T163000
DTSTAMP:20260501T112450
CREATED:20260108T211634Z
LAST-MODIFIED:20260122T164709Z
UID:10003870-1769779800-1769790600@cmsa.fas.harvard.edu
SUMMARY:Freedman Seminar: Michael Freedman\, CMSA & Slava Krushkal\, University of Virginia
DESCRIPTION:Freedman Seminar \nSpeakers: Michael Freedman\, CMSA and Slava Krushkal\, University of Virginia (2-3 pm and 3:15-4:15 pm) \nTitle: Formulating 4D surgery for AI agents \nAbstract: The topological category surgery exact sequence is still open for free groups (and most groups of exponential growth). The lack of knowledge is about both surgery and s-cobordism; and the source of the mystery is the same in both cases. Thinking about how to present this problem to AIs has had its own value. In a pair of talks we will explain how we have thought about the problem in the past and how we are thinking about it now.
URL:https://cmsa.fas.harvard.edu/event/freedman_13026/
LOCATION:Hybrid
CATEGORIES:Freedman Seminar
ATTACH;FMTTYPE=image/png:https://cmsa.fas.harvard.edu/media/CMSA-Freedman-Seminar-1.30.26-1-scaled.png
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