Semiclassical approaches to IR issues in quasi de Sitter universes

          @misc{ scivideos_PIRSA:10100075,
            doi = {10.48660/10100075},
            url = {https://pirsa.org/10100075},
            author = {Sloth, Martin},
            keywords = {Cosmology},
            language = {en},
            title = {Semiclassical approaches to IR issues in quasi de Sitter universes },
            publisher = {Perimeter Institute for Theoretical Physics},
            year = {2010},
            month = {oct},
            note = {PIRSA:10100075 see, \url{https://scivideos.org/index.php/pirsa/10100075}}
          }
          

Abstract

Using simple semiclassical relations it is possible to show that the conventional cosmological correlation functions are affected by significant IR corrections in quasi de Sitter space-times when averaged over very large volumes (in the "large box"). The IR effects apparently imply a breakdown of perturbation theory in the large box on sufficiently long time scales, for example the time between self-reproduction and reheating in chaotic inflation. An interpretation of the apparent breakdown of the perturbative expansion of gravity will also be briefly discussed.