PIRSA:17060027

Video URL

https://pirsa.org/17060027

Rethinking time at the Big Bang

Gould, E. (2017). Rethinking time at the Big Bang. Perimeter Institute for Theoretical Physics. https://pirsa.org/17060027

Gould, Elizabeth. Rethinking time at the Big Bang. Perimeter Institute for Theoretical Physics, Jun. 01, 2017, https://pirsa.org/17060027 

          @misc{ scivideos_PIRSA:17060027,
            doi = {10.48660/17060027},
            url = {https://pirsa.org/17060027},
            author = {Gould, Elizabeth},
            keywords = {Other Physics},
            language = {en},
            title = {Rethinking time at the Big Bang},
            publisher = {Perimeter Institute for Theoretical Physics},
            year = {2017},
            month = {jun},
            note = {PIRSA:17060027 see, \url{https://scivideos.org/index.php/pirsa/17060027}}
          }

Elizabeth Gould Arthur B. McDonald Canadian Astroparticle Physics Research Institute

Talk numberPIRSA:17060027
DOI10.48660/17060027
Source RepositoryPIRSA
Collection
Talk Type Conference
Subject

Abstract

I will discuss two ways in which revising the notion of time at the Big Bang will lead to testable predictions. I will then contrast these predictions against standard ΛCDM scenario, and cosmological observations. The first model, Holographic Cosmology, is based on a 3d quantum field theory without time, suggesting the possibility of nonperturbative effects on large angles (l<30) in the CMB sky. The second model, Periodic Time Cosmology, relates (past and future) cosmic expansion history to the spectrum of cosmic perturbations by demanding consistency with an exactly periodic notion of time. Comparing this model to observations leads to surprising implications for dark energy and/or neutrino masses in cosmology.