PIRSA:10100089

Resumming late time divergences and comparing thermal vs dS

Leblond, L. (2010). Resumming late time divergences and comparing thermal vs dS. Perimeter Institute. https://pirsa.org/10100089

Leblond, Louis. Resumming late time divergences and comparing thermal vs dS. Perimeter Institute, Oct. 27, 2010, https://pirsa.org/10100089 

          @misc{ pirsa_PIRSA:10100089,
            doi = {10.48660/10100089},
            url = {https://pirsa.org/10100089},
            author = {Leblond, Louis},
            keywords = {Cosmology},
            language = {en},
            title = {Resumming late time divergences and comparing thermal vs dS},
            publisher = {Perimeter Institute},
            year = {2010},
            month = {oct},
            note = {PIRSA:10100089 see, \url{https://pirsa.org}}
          }

Louis Leblond Pennsylvania State University

DOI 10.48660/10100089
Collection
Talk Type Conference
Subject

Abstract

I will argue that the dynamical renormalization group can be used to resum late time divergences appearing in loop computations in de Sitter. In the case of a scalar field with quartic interactions, the resummed propagator is the massive one. Standard mean field theory techniques can then be used to estimate the mass. This is analogous to the thermal field theory story but with some notable differences. We discuss whether a critical point can exist in dS where mean field methods fail.