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DTSTART;TZID=America/New_York:20261026T163000
DTEND;TZID=America/New_York:20261026T173000
DTSTAMP:20261013T151129Z
CREATED:20260729T200800Z
LAST-MODIFIED:20261013T151129Z
UID:10004030-1793032200-1793035800@live-hu-cmsa-222.pantheonsite.io
SUMMARY:The Geography of Symplectic 4-Manifolds
DESCRIPTION:Colloquium \nSpeaker: Anar Akhmedov\, University of Minnesota \nTitle: The Geography of Symplectic 4-Manifolds \nAbstract: The symplectic geography problem\, originally posed by J. McCarthy-J. Wolfson and R. Gompf\, asks which ordered pairs of nonnegative integers are realized as (\chi(X)\,c_1^2(X)) for a symplectic 4-manifold X\, where \chi(X)=(e(X)+\sigma(X))/4. In this talk\, we will address the geography of simply connected spin and nonspin symplectic 4-manifolds with small Euler characteristic\, with nonnegative signature\, or near the Bogomolov-Miyaoka-Yau line c_1^2(X)=9\chi_h(X). We will also discuss recent developments\, including joint work with Sai-Kee Yeung on symplectic fake quadrics and related questions motivated by fake projective planes and Cartwright-Steger surfaces. \n  \n\nTo subscribe or unsubscribe to the colloquium mailing list\, please visit this link.
URL:https://live-hu-cmsa-222.pantheonsite.io/event/colloquium-102626/
LOCATION:CMSA Room G10\, CMSA\, 20 Garden Street\, Cambridge\, MA\, 02138\, United States
CATEGORIES:Colloquium
ATTACH;FMTTYPE=image/png:https://live-hu-cmsa-222.pantheonsite.io/media/2026/07/CMSA-Colloquium-10.26.2026.docx-scaled.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20261102T163000
DTEND;TZID=America/New_York:20261102T173000
DTSTAMP:20261021T200048Z
CREATED:20260729T200831Z
LAST-MODIFIED:20261021T200048Z
UID:10004031-1793637000-1793640600@live-hu-cmsa-222.pantheonsite.io
SUMMARY:Extreme Diffusion
DESCRIPTION:Colloquium \nSpeaker: Ivan Corwin (Columbia University) \nTitle: Extreme Diffusion \nAbstract: Two hundred years ago\, Robert Brown observed the statistics of the motion of grains of pollen in water. It took almost one hundred years for Einstein and others to develop an effective theory describing this motion as that of a random walker. In this talk\, I will challenge a key implication of this well established theory. When studying systems with very large numbers of particles diffusing together\, I will argue that the Einstein random walk theory breaks down when it comes to predicting the statistical behavior of extreme particles—those that move the fastest and furthest in the system. In its place\, I will describe a new theory of extreme diffusion which captures the effect of the hidden environment in which particles diffuse together and allows us to interrogate that environment by studying extreme particles. I will highlight one piece of mathematics that led us to develop this theory—a non-commutative binomial theorem—and hint at other connections to integrable probability\, quantum integrable systems and stochastic PDEs. \n  \n\nTo subscribe or unsubscribe to the colloquium mailing list\, please visit this link.
URL:https://live-hu-cmsa-222.pantheonsite.io/event/colloquium-11226/
LOCATION:CMSA Room G10\, CMSA\, 20 Garden Street\, Cambridge\, MA\, 02138\, United States
CATEGORIES:Colloquium
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END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20261109T163000
DTEND;TZID=America/New_York:20261109T173000
DTSTAMP:20261013T151232Z
CREATED:20260729T200854Z
LAST-MODIFIED:20261013T151232Z
UID:10004032-1794241800-1794245400@live-hu-cmsa-222.pantheonsite.io
SUMMARY:Colloquium
DESCRIPTION:Colloquium \nSpeaker: Lukas Müller (LMU Munich) \n  \n  \n  \n  \n\nTo subscribe or unsubscribe to the colloquium mailing list\, please visit this link.
URL:https://live-hu-cmsa-222.pantheonsite.io/event/colloquium-11926/
LOCATION:CMSA Room G10\, CMSA\, 20 Garden Street\, Cambridge\, MA\, 02138\, United States
CATEGORIES:Colloquium
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20261116T163000
DTEND;TZID=America/New_York:20261116T173000
DTSTAMP:20261013T151243Z
CREATED:20260729T200924Z
LAST-MODIFIED:20261013T151243Z
UID:10004033-1794846600-1794850200@live-hu-cmsa-222.pantheonsite.io
SUMMARY:Snake graphs and q-deformed real numbers
DESCRIPTION:Colloquium \nSpeaker: James Propp (UMass Lowell) \nTitle: Snake graphs and q-deformed real numbers \nAbstract: I’ll present a statistical-mechanical construction of q-deformed real numbers [[x]]_q\, inspired by the q-deformed rational numbers [x]_q of Morier-Genoud and Ovsienko. The new construction admits two equivalent formulations: one in terms of random filters in snake posets and the other in terms of random dimer covers of snake graphs. \nI’ll begin with a combinatorial approach to Stern’s diatomic series and the Calkin–Wilf bijection via finite snake graphs\, and then construct q-deformed rational numbers by introducing an activity parameter q into the model. I extend from q-deformed rationals to q-deformed reals by passing from finite to infinite snake graphs; the main technical step is to show that the associated limiting probability measures are well defined. \nThe resulting q-deformation [[x]]_q satisfies [[x]]_1 = x for all x>0. There’s evidence that\, wherever both [x]_q and [[x]]_q are defined\, [[x]]_q = q [x]_q. For more details\, see arXiv:2607.14332. \n  \n\nTo subscribe or unsubscribe to the colloquium mailing list\, please visit this link.
URL:https://live-hu-cmsa-222.pantheonsite.io/event/colloquium-111626/
LOCATION:CMSA Room G10\, CMSA\, 20 Garden Street\, Cambridge\, MA\, 02138\, United States
CATEGORIES:Colloquium
ATTACH;FMTTYPE=image/png:https://live-hu-cmsa-222.pantheonsite.io/media/2026/07/CMSA-Colloquium-11.16.2026.docx-scaled.png
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20261123T163000
DTEND;TZID=America/New_York:20261123T173000
DTSTAMP:20261013T151255Z
CREATED:20260729T200958Z
LAST-MODIFIED:20261013T151255Z
UID:10004034-1795451400-1795455000@live-hu-cmsa-222.pantheonsite.io
SUMMARY:Colloquium
DESCRIPTION:Colloquium \nSpeaker: Ewain Gwynne\, U Chicago \n  \n  \n  \n\nTo subscribe or unsubscribe to the colloquium mailing list\, please visit this link.
URL:https://live-hu-cmsa-222.pantheonsite.io/event/colloquium-112326/
LOCATION:CMSA Room G10\, CMSA\, 20 Garden Street\, Cambridge\, MA\, 02138\, United States
CATEGORIES:Colloquium
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20261130T163000
DTEND;TZID=America/New_York:20261130T173000
DTSTAMP:20261013T151306Z
CREATED:20260729T201026Z
LAST-MODIFIED:20261013T151306Z
UID:10004035-1796056200-1796059800@live-hu-cmsa-222.pantheonsite.io
SUMMARY:Colloquium
DESCRIPTION:Colloquium \n  \n  \n  \n\nTo subscribe or unsubscribe to the colloquium mailing list\, please visit this link.
URL:https://live-hu-cmsa-222.pantheonsite.io/event/colloquium-113026/
LOCATION:CMSA Room G10\, CMSA\, 20 Garden Street\, Cambridge\, MA\, 02138\, United States
CATEGORIES:Colloquium
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20261207T163000
DTEND;TZID=America/New_York:20261207T173000
DTSTAMP:20261013T151319Z
CREATED:20260729T201051Z
LAST-MODIFIED:20261013T151319Z
UID:10004036-1796661000-1796664600@live-hu-cmsa-222.pantheonsite.io
SUMMARY:Colloquium
DESCRIPTION:Colloquium \nSpeaker: Roberto De Leo\, Howard University \n  \n  \n  \n\nTo subscribe or unsubscribe to the colloquium mailing list\, please visit this link.
URL:https://live-hu-cmsa-222.pantheonsite.io/event/colloquium-12726/
LOCATION:CMSA Room G10\, CMSA\, 20 Garden Street\, Cambridge\, MA\, 02138\, United States
CATEGORIES:Colloquium
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20270201T163000
DTEND;TZID=America/New_York:20270201T173000
DTSTAMP:20261013T151343Z
CREATED:20260924T184143Z
LAST-MODIFIED:20261013T151343Z
UID:10004049-1801499400-1801503000@live-hu-cmsa-222.pantheonsite.io
SUMMARY:Colloquium
DESCRIPTION:Colloquium \nSpeaker: Nina Holden (NYU) \n  \n  \n  \n\nTo subscribe or unsubscribe to the colloquium mailing list\, please visit this link.
URL:https://live-hu-cmsa-222.pantheonsite.io/event/colloquium_2127/
LOCATION:CMSA Room G10\, CMSA\, 20 Garden Street\, Cambridge\, MA\, 02138\, United States
CATEGORIES:Colloquium
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=America/New_York:20270208T163000
DTEND;TZID=America/New_York:20270208T173000
DTSTAMP:20261013T151358Z
CREATED:20260922T152756Z
LAST-MODIFIED:20261013T151358Z
UID:10004048-1802104200-1802107800@live-hu-cmsa-222.pantheonsite.io
SUMMARY:Colloquium
DESCRIPTION:Colloquium \nSpeaker: Giulio Biroli\, ENS Paris \n  \n  \n  \n\nTo subscribe or unsubscribe to the colloquium mailing list\, please visit this link.
URL:https://live-hu-cmsa-222.pantheonsite.io/event/colloquium-2727/
LOCATION:CMSA Room G10\, CMSA\, 20 Garden Street\, Cambridge\, MA\, 02138\, United States
CATEGORIES:Colloquium
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