Geometry and Topology Seminar

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The Geometry and Topology seminar meets in room 901 of Van Vleck Hall on Fridays from 1:20pm - 2:10pm. For more information, contact Shaosai Huang.

In the fall of 2020, we will hold online meetings on Zoom platform (available every Friday 1:00pm - 2:30pm).


Fall 2020

date speaker title host(s)
Oct. 23 Yu Li (Stony Brook) On the ancient solutions to the Ricci flow (Huang)
Oct. 30 Yi Lai (Berkeley) A family of 3d steady gradient solitons that are flying wings (Huang)
Nov. 6 Jiyuan Han (Purdue) TBA (Chen)
Nov. 20 Max Hallgren (Cornell) TBA (Huang)
Dec. 4 Yang Li (IAS) TBA (Chen)

Fall Abstracts

Yu Li

Ancient solutions model the singularity formation of the Ricci flow.  In two and three dimensions, we currently have complete classifications for κ-noncollapsed ancient solutions, while the higher dimensional problem remains open. This talk will survey some recent developments of κ-noncollapsed ancient solutions with nonnegative curvature in higher dimensions.

Yi Lai

We found a family of $\mathbb{Z}_2\times O(2)$-symmetric 3d steady gradient Ricci solitons. We show that these solitons are all flying wings. This confirms a conjecture of Hamilton.

Archive of past Geometry seminars

2019-2020 Geometry_and_Topology_Seminar_2019-2020

2018-2019 Geometry_and_Topology_Seminar_2018-2019

2017-2018 Geometry_and_Topology_Seminar_2017-2018

2016-2017 Geometry_and_Topology_Seminar_2016-2017

2015-2016: Geometry_and_Topology_Seminar_2015-2016

2014-2015: Geometry_and_Topology_Seminar_2014-2015

2013-2014: Geometry_and_Topology_Seminar_2013-2014

2012-2013: Geometry_and_Topology_Seminar_2012-2013

2011-2012: Geometry_and_Topology_Seminar_2011-2012

2010: Fall-2010-Geometry-Topology