PIRSA:13030096

Effective field theory approach to quasi-single field inflation

Yamaguchi, M. (2013). Effective field theory approach to quasi-single field inflation. Perimeter Institute. https://pirsa.org/13030096

Yamaguchi, Masahide. Effective field theory approach to quasi-single field inflation. Perimeter Institute, Mar. 12, 2013, https://pirsa.org/13030096 

          @misc{ pirsa_PIRSA:13030096,
            doi = {10.48660/13030096},
            url = {https://pirsa.org/13030096},
            author = {Yamaguchi, Masahide},
            keywords = {Cosmology},
            language = {en},
            title = {Effective field theory approach to quasi-single field inflation},
            publisher = {Perimeter Institute},
            year = {2013},
            month = {mar},
            note = {PIRSA:13030096 see, \url{https://pirsa.org}}
          }

Masahide Yamaguchi Tokyo Institute of Technology

Talk numberPIRSA:13030096
DOI10.48660/13030096
Collection
Talk Type Scientific Series
Subject

Abstract

We apply the effective field theory approach to quasi-single field inflation, which contains an additional scalar field with Hubble scale mass other than inflaton.  Based on the time-dependent spatial diffeomorphism, which is not broken by the time-dependent background evolution, the most generic action of quasi-single field inflation is constructed up to third order fluctuations.  Using the obtained action, the effects of the additional massive scalar field on the primordial curvature perturbations are discussed.  In particular, we calculate the power spectrum and discuss the momentum-dependence of three point functions in the squeezed limit for general settings of quasi-single field inflation.  Our framework can be also applied to inflation models with heavy particles. We make a qualitative discussion on the effects of heavy particles during inflation and that of sharp turning trajectory in our framework.