Geometry Lunch Seminar

This is a weekly event for anyone interested in geometry.

For in-person talks, catered food is expected at 12:00 p.m.; however, this, and especially time of delivery, cannot be guaranteed.

The talk starts at 12:20 and last for 40--45 minutes.

A ZOOM option is available at https://psu.zoom.us/j/92042020925

Organizers: Stephanie Geyer, Dmitri Burago, Anton Petrunin, Rachel Weaver, Jeffrey Case, Dawit Mengesha

Reserve a room in McAllister

Schedule 2026–27

DateRoomSpeakerTitle
Wed, Aug 26, 2026, 12:20 pm - 1:30 pm114 McAllisterAnton PetruninMilnor's cartography problem
Wed, Sep 2, 2026, 12:20 pm - 1:30 pm114 McAllisterJeffrey CaseThe Gauss-Bonnet-Chern formula via scalar conformal invariants
Wed, Sep 9, 2026, 12:20 pm - 1:30 pm114 McAllisterDawit MengeshaThe sharp L²-Michael-Simon-Sobolev inequality via conformal geometry
Wed, Sep 16, 2026, 12:20 pm - 1:30 pm114 McAllisterGrigory Yakovlev (zoom)The Existence of Non-Equivariant Gromov Tori
Wed, Sep 23, 2026, 12:20 pm - 1:30 pm114 McAllisterQin Deng (zoom)Topology of two-dimensional collapsed spaces with lower Ricci bounds
Tue, Sep 29, 2026, 12:20 pm - 1:20 pm114 McAllisterUntitled
Wed, Sep 30, 2026, 12:20 pm - 1:30 pmZOOMAriel Goodwin (zoom)Convex hulls in geodesic spaces of nonpositive curvature
Tue, Oct 6, 2026, 12:20 pm - 1:20 pm114 McAllisterJean-Luc BrylinskiLagrangian Correspondences and a Compactification of the Symplectic Group
Wed, Oct 7, 2026, 12:20 pm - 1:30 pm114 McAllisterDong Xie (zoom)Multiplicity of Closed Geodesics on Finsler Manifolds
Wed, Oct 14, 2026, 12:20 pm - 1:30 pm114 McAllisterCameron Rudd (zoom)Magnetic geodesics and Cheeger-esque inequalities for 1-forms
Wed, Oct 21, 2026, 12:20 pm - 1:30 pm114 McAllisterPei-Ken Hung (zoom)A metric on S² x S² with positive sectional curvature
Wed, Oct 28, 2026, 12:20 pm - 1:30 pm114 McAllisterAndrea Malchiodi (zoom)Untitled
Wed, Nov 4, 2026, 12:20 pm - 1:30 pm114 McAllisterTristan Riviere (zoom)The Geometric Analysis of Hamiltonian Stationary Surfaces
Wed, Nov 11, 2026, 12:20 pm - 1:30 pm114 McAllisterMark BerezovikBilliards and Hofer’s Geometry
Wed, Nov 18, 2026, 12:20 pm - 1:30 pm114 McAllisterDaniele Semola (zoom)New topological restrictions for spaces with nonnegative Ricci curvature
Wed, Nov 25, 2026, 12:20 pm - 1:30 pm114 McAllisterThanksgiving HolidayNO SEMINAR
Wed, Dec 2, 2026, 12:20 pm - 1:30 pm114 McAllisterClemens Sämann (zoom)Untitled
Wed, Dec 9, 2026, 12:20 pm - 1:30 pm114 McAllisterVitali Kapovitch (zoom)Sharp bounds and rigidity for volumes of boundaries of Alexandrov spaces
Wed, Jan 13, 2027, 12:20 pm - 1:30 pm114 McAllisterGabor SzekelyhidiUntitled
Wed, Jan 20, 2027, 12:20 pm - 1:30 pm114 McAllisterMartin WinterUntitled
Wed, Jan 27, 2027, 12:20 pm - 1:30 pm114 McAllisterUntitled
Wed, Feb 3, 2027, 12:20 pm - 1:30 pm114 McAllisterUntitled
Wed, Feb 10, 2027, 12:20 pm - 1:30 pm114 McAllisterUntitled
Wed, Feb 17, 2027, 12:20 pm - 1:30 pm114 McAllisterUntitled
Wed, Feb 24, 2027, 12:20 pm - 1:30 pm114 McAllisterChristos MantoulidisUntitled
Wed, Mar 3, 2027, 12:20 pm - 1:30 pm114 McAllisterUntitled
Wed, Mar 10, 2027, 12:20 pm - 1:30 pm114 McAllisterSPRING BREAKNO SEMINAR
Wed, Mar 17, 2027, 12:20 pm - 1:30 pm114 McAllisterUntitled
Wed, Mar 24, 2027, 12:20 pm - 1:30 pm114 McAllisterUntitled
Wed, Mar 31, 2027, 12:20 pm - 1:30 pm114 McAllisterUntitled
Wed, Apr 7, 2027, 12:20 pm - 1:30 pm114 McAllisterUntitled
Wed, Apr 14, 2027, 12:20 pm - 1:30 pm114 McAllisterUntitled
Wed, Apr 21, 2027, 12:20 pm - 1:30 pm114 McAllisterUntitled
Wed, Apr 28, 2027, 12:20 pm - 1:30 pm114 McAllisterUntitled

Academic years

2026–27 · 2025–26 · 2024–25 · 2023–24 · 2022–23 · 2021–22 · 2020–21 · 2019–20 · 2018–19 · 2017–18 · 2016–17 · 2015–16 · 2014–15 · 2013–14 · 2012–13 · 2011–12 · 2010–11 · 2009–10

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