PIRSA:09120019

Video URL

https://pirsa.org/09120019

Quantum backreaction in cosmology

Prokopec, T. (2009). Quantum backreaction in cosmology. Perimeter Institute for Theoretical Physics. https://pirsa.org/09120019

Prokopec, Tomislav. Quantum backreaction in cosmology. Perimeter Institute for Theoretical Physics, Dec. 01, 2009, https://pirsa.org/09120019 

          @misc{ scivideos_PIRSA:09120019,
            doi = {10.48660/09120019},
            url = {https://pirsa.org/09120019},
            author = {Prokopec, Tomislav},
            keywords = {Cosmology},
            language = {en},
            title = {Quantum backreaction in cosmology},
            publisher = {Perimeter Institute for Theoretical Physics},
            year = {2009},
            month = {dec},
            note = {PIRSA:09120019 see, \url{https://scivideos.org/pirsa/09120019}}
          }

Tomislav Prokopec Utrecht University

Talk numberPIRSA:09120019
DOI10.48660/09120019
Source RepositoryPIRSA
Collection
Talk Type Scientific Series
Subject

Abstract

The problem of the quantum backreaction in expanding spaces is an old, as yet unresolved, question. In this talk I will consider the one-loop backreaction of a massless scalar which couples to the Ricci scalar in an expanding space with constant deceleration. I will show that the infrared divergences, which generically plague the one loop stress energy, can be removed by matching onto an earlier radiation era. An insignificant backreaction occurs, unless the coupling to the Ricci scalar is negative. Similar results hold for the graviton backreaction.