PIRSA:22020063

Video URL

https://pirsa.org/22020063

Ultralocality and the robustness of slow contraction to cosmic initial conditions

Ijjas, A. (2022). Ultralocality and the robustness of slow contraction to cosmic initial conditions. Perimeter Institute for Theoretical Physics. https://pirsa.org/22020063

Ijjas, Anna. Ultralocality and the robustness of slow contraction to cosmic initial conditions. Perimeter Institute for Theoretical Physics, Feb. 17, 2022, https://pirsa.org/22020063 

          @misc{ scivideos_PIRSA:22020063,
            doi = {10.48660/22020063},
            url = {https://pirsa.org/22020063},
            author = {Ijjas, Anna},
            keywords = {Strong Gravity},
            language = {en},
            title = {Ultralocality and the robustness of slow contraction to cosmic initial conditions},
            publisher = {Perimeter Institute for Theoretical Physics},
            year = {2022},
            month = {feb},
            note = {PIRSA:22020063 see, \url{https://scivideos.org/index.php/pirsa/22020063}}
          }

Anna Ijjas Max Planck Institute for Gravitational Physics - Albert Einstein Institute (AEI)

Talk numberPIRSA:22020063
DOI10.48660/22020063
Source RepositoryPIRSA
Collection
Talk Type Scientific Series
Subject

Abstract

I will discuss the detailed process by which slow contraction smooths and flattens the universe using an improved numerical relativity code that accepts initial conditions with non-perturbative deviations from homogeneity and isotropy along two independent spatial directions. Contrary to common descriptions of the early universe, I will show that the geometry first rapidly converges to an inhomogeneous, spatially-curved, and anisotropic ultralocal state in which all spatial gradient contributions to the equations of motion decrease as an exponential in time to negligible values. This is followed by a second stage in which the geometry converges to a homogeneous, spatially flat, and isotropic spacetime. In particular, the decay appears to follow the same history whether the entire spacetime or only parts of it are smoothed by the end of slow contraction.

Zoom Link: https://pitp.zoom.us/j/95441238892?pwd=TUh4Mjh1MHJ6TDNCL0V1NUk5WWFZQT09