This paper starts from a toy model for inflation in a class of modified theories of gravity in the metric formalism. Instead of the standard procedure—assuming a non-linear Lagrangian f(R) in the Jordan frame—we start from a simple phi2 potential in the Einstein frame and investigate the corresponding f(R) in the former picture. The addition of an ad-hoc Cosmological Constant in the Einstein frame leads to a Thermodynamical interpretation of this physical system, which allows further insight on its (meta)stability and evolution.
Journal of Cosmology and Astroparticle Physics
- Pub Date:
- June 2020
- General Relativity and Quantum Cosmology;
- Astrophysics - Cosmology and Nongalactic Astrophysics;
- High Energy Physics - Theory
- 13 pages, 11 figures. Matches version accepted for publication in JCAP