PIRSA:16030085

Video URL

https://pirsa.org/16030085

Cosmological singularities in holography

Schillo, M. (2016). Cosmological singularities in holography. Perimeter Institute for Theoretical Physics. https://pirsa.org/16030085

Schillo, Marjorie. Cosmological singularities in holography. Perimeter Institute for Theoretical Physics, Mar. 15, 2016, https://pirsa.org/16030085 

          @misc{ scivideos_PIRSA:16030085,
            doi = {10.48660/16030085},
            url = {https://pirsa.org/16030085},
            author = {Schillo, Marjorie},
            keywords = {Quantum Fields and Strings},
            language = {en},
            title = {Cosmological singularities in holography},
            publisher = {Perimeter Institute for Theoretical Physics},
            year = {2016},
            month = {mar},
            note = {PIRSA:16030085 see, \url{https://scivideos.org/pirsa/16030085}}
          }

Marjorie Schillo Katholieke Universiteit Leuven

Talk numberPIRSA:16030085
DOI10.48660/16030085
Source RepositoryPIRSA
Collection
Talk Type Scientific Series
Subject

Abstract

I will discuss recent work on big crunch singularities produced in asymptotic AdS cosmologies using gauge/gravity duality. The dual description consists of a constant mass deformation of ABJM theory on de Sitter space and is well-defined and stable for small deformations.

  There is a critical deformation where the theory becomes unstable at weak and at strong coupling. I will discuss a field theory diagnostic of this instability as well as boundary two-point correlators calculated via the geodesic approximation. Near the critical deformation a second saddle point contribution enters, in which the spacelike geodesics probe the high curvature region near the singularity. Its contribution strongly enhances the long-distance correlations. This has a natural interpretation in the weakly coupled boundary theory where the critical point corresponds to a massless limit.