# Seminars & Colloquia Calendar

## Wall Crossings and Lagrangian Cobordisms

#### Jeff Hicks, Cambridge

Location: ** Webex. Email ctw@math.rutgers.edu for link/password**

Date & time: Thursday, 16 April 2020 at 2:00PM - 3:00PM

We expect that two Lagrangian submanifolds have matching Floer theoretic invariants if they are related by a Hamiltonian isotopy. For example, an appropriately weighted count of Maslov index 2 disks with boundary on a Lagrangian L should remain unchanged under Hamiltonian isotopy. If the Hamiltonian isotopy is not very nice -- say that at some point the isotopy passes through a Lagrangian which bounds a non-regular Maslov index 0 disk -- then weights used to count the disks need to be corrected by a ``wall crossing transformation'' to obtain invariance. These transformations end up playing an important role in mirror symmetry, where they are the coordinate transformations used to build a mirror space from an SYZ fibration.

Lagrangian cobordisms give an equivalence relation on Lagrangian submanifolds which is weaker than Lagrangian isotopy, but is still expected to preserve Floer theory. In this talk, we look at a first example of a non-cylindrical Lagrangian cobordism providing an equivalence of Lagrangian Floer theory, and relate this to the story of wall-crossing arising from Hamiltonian isotopy.

R. Shapiro Organizer's Page

Chiara Damiolini, Ian Coley and Franco Rota -Charles Weibel Organizer's Page

Brooke Logan

Narek Hovsepyan and Ewerton Rocha Vieira Organizer's page

Ziming Shi, Sagun Chanillo, Xiaojun Huang, Chi Li, Jian Song Seminar website Old seminar website

Swastik Kopparty, Sepehr Assadi Seminar webpage

Jeffry Kahn, Bhargav Narayanan, Jinyoung Park Organizer's webpage

Brooke Ogrodnik, Website

Robert Dougherty-Bliss and Doron Zeilberger --> homepage

Paul Feehan, Daniel Ketover, Natasa Sesum Organizer's webpage

Lev Borisov, Emanuel Diaconescu, Angela Gibney, Nicolas Tarasca, and Chris Woodward Organizer's webpage

Hong Chen Seminar webpage

Fanxin Wu and Nkhalo Malawo

James Holland; Organizer website

Edna Jones Organizer's webpage

Brooke Ogrodnik website

Yanyan Li, Zheng-Chao Han, Jian Song, Natasa Sesum Organizer's Webpage

Organizer: Luochen Zhao

Yanyan Li, Zheng-Chao Han, Natasa Sesum, Jian Song Organizer's Page

Lisa Carbone, Yi-Zhi Huang, James Lepowsky, Siddhartha Sahi Organizer's webpage

Simon Thomas website

Kasper Larsen, Daniel Ocone and Kim Weston Organizer's page

Joel Lebowitz, Michael Kiessling

Yanyan Li, Haim Brezis Organizer's Webpage

Stephen D. Miller, John C. Miller, Alex V. Kontorovich, Alex Walker seminar website

Stephen D. Miller

Brooke Ogrodnik, Website

Organizers: Yanyan Li, Z.C. Han, Jian Song, Natasa Sesum

Yael Davidov Seminar webpage

Kristen Hendricks, Xiaochun Rong, Hongbin Sun, Chenxi Wu Organizer's page

Fioralba Cakoni Seminar webpage

Ebru Toprak, Organizer

Organizer's webpage: Organizer's webpage

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