PIRSA:21050022

Summing over geometries in string theory

APA

Eberhardt, L. (2021). Summing over geometries in string theory . Perimeter Institute. https://pirsa.org/21050022

MLA

Eberhardt, Lorenz. Summing over geometries in string theory . Perimeter Institute, May. 25, 2021, https://pirsa.org/21050022

BibTex

          @misc{ pirsa_21050022,
            doi = {},
            url = {https://pirsa.org/21050022},
            author = {Eberhardt, Lorenz},
            keywords = {Quantum Fields and Strings},
            language = {en},
            title = {Summing over geometries in string theory },
            publisher = {Perimeter Institute},
            year = {2021},
            month = {may},
            note = {PIRSA:21050022 see, \url{https://pirsa.org}}
          }
          

Abstract

I discuss the question how string theory achieves a sum over bulk geometries with fixed asymptotic boundary conditions. I analyze this problem with the help of the tensionless string on AdS3xS3xT4 (with one unit of NS-NS flux) that was recently understood to be dual to the symmetric orbifold of T4. I argue that large stringy corrections around a fixed background can be interpreted as different semiclassical geometries, thus making a sum over semi-classical geometries superfluous.