PIRSA:15080020

Video URL

https://pirsa.org/15080020

Fine Tuning May Not Be Enough

Woodard, R. (2015). Fine Tuning May Not Be Enough. Perimeter Institute for Theoretical Physics. https://pirsa.org/15080020

Woodard, Richard. Fine Tuning May Not Be Enough. Perimeter Institute for Theoretical Physics, Aug. 11, 2015, https://pirsa.org/15080020 

          @misc{ scivideos_PIRSA:15080020,
            doi = {10.48660/15080020},
            url = {https://pirsa.org/15080020},
            author = {Woodard, Richard},
            keywords = {Cosmology, Other Physics},
            language = {en},
            title = {Fine Tuning May Not Be Enough},
            publisher = {Perimeter Institute for Theoretical Physics},
            year = {2015},
            month = {aug},
            note = {PIRSA:15080020 see, \url{https://scivideos.org/pirsa/15080020}}
          }

Richard Woodard University of Florida

Talk numberPIRSA:15080020
DOI10.48660/15080020
Source RepositoryPIRSA
Collection
Talk Type Conference
Subject

Abstract

This talk is based on arXiv:1506.07306, with Shun-Pei Miao. We argue that the fine tuning problems of scalar-driven inflation may be worse than is commonly believed. The reason is that reheating requires the inflaton to be coupled to other matter fields whose vacuum fluctuations alter the inflaton potential. The usual response has been that even more fine-tuning of the classical potential $V(\varphi)$ can repair any damage done in this way. We point out that the effective potential in de Sitter background actually depends in a complicated way upon the dimensionless combination of $\varphi/H$. We also show that the factors of $H$ which occur in de Sitter do not even correspond to local functionals of the metric for general geometries, nor are they Planck-suppressed.