Video URL

https://pirsa.org/16100049

On the mathematics of étale gerbes inspired by physics

Tseng, H. (2016). On the mathematics of étale gerbes inspired by physics. Perimeter Institute for Theoretical Physics. https://pirsa.org/16100049

Tseng, Hsian-Hua. On the mathematics of étale gerbes inspired by physics. Perimeter Institute for Theoretical Physics, Oct. 13, 2016, https://pirsa.org/16100049 

          @misc{ scivideos_PIRSA:16100049,
            doi = {10.48660/16100049},
            url = {https://pirsa.org/16100049},
            author = {Tseng, Hsian-Hua},
            keywords = {Mathematical physics},
            language = {en},
            title = {On the mathematics of {\'e}tale gerbes inspired by physics},
            publisher = {Perimeter Institute for Theoretical Physics},
            year = {2016},
            month = {oct},
            note = {PIRSA:16100049 see, \url{https://scivideos.org/index.php/pirsa/16100049}}
          }

Hsian-Hua Tseng Ohio State University

DOI 10.48660/16100049
Source Repository PIRSA
Collection
Talk Type Scientific Series
Subject

Abstract

For a finite group G, a G-gerbe over a space B can be thought of as a fiber bundle over B with fibers the classifying orbifold BG. Hellerman-Henriques-Pantev-Sharpe studied conformal field theories on G-gerbes. Given a G-gerbe Y-> B, they constructed a disconnected space \widehat{Y} endowed with a locally constant U(1) 2-cocycle c. They conjectured that a CFT on Y is equivalent to a CFT on \widehat{Y} twisted by the "B-field" c. In this talk, I plan to explain the constructions in this conjecture and the mathematical side of the story, in particular the viewpoints from noncommutative geometry and Gromov-Witten theory. This is based on joint work with Xiang Tang.