# Difference between revisions of "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'''. | + | 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 | + | In the fall of 2020, we will hold '''online meetings''' on |

+ | [https://uwmadison.zoom.us/j/94578957620 Zoom platform] | ||

+ | (available every '''Friday 1:00pm - 2:30pm'''). | ||

<br> | <br> | ||

− | + | ||

[[Image:Hawk.jpg|thumb|300px]] | [[Image:Hawk.jpg|thumb|300px]] | ||

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!align="left" | host(s) | !align="left" | host(s) | ||

|- | |- | ||

− | |TBA | + | |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) | |Max Hallgren (Cornell) | ||

| TBA | | TBA | ||

|(Huang) | |(Huang) | ||

|- | |- | ||

− | | | + | |Dec. 4 |

− | | | + | |Yang Li (IAS) |

| TBA | | TBA | ||

− | |( | + | |(Chen) |

|} | |} | ||

== Fall Abstracts == | == 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 == | == Archive of past Geometry seminars == |

## Latest revision as of 14:55, 12 October 2020

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

Dynamics_Seminar_2020-2021