Inflation from fermions with curvature-dependent mass

D. Benisty, E. I. Guendelman, E. N. Saridakis, H. Stoecker, J. Struckmeier, D. Vasak

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

A model of inflation realization driven by fermions with curvature-dependent mass is studied. Such a term is derived from the covariant canonical gauge theory of gravity (CCGG) incorporating Dirac fermions. We obtain an initial de Sitter phase followed by a successful exit, and moreover we acquire the subsequent thermal history, with an effective matter era, followed finally by a dark-energy epoch. This behavior is a result of the effective "weakening" of gravity at early times, due to the increased curvature-dependent fermion mass. Investigating the scenario at the perturbation level, using the correct coupling parameter, the scalar spectral index and tensor-to-scalar ratio are obtained in agreement with Planck observations. Moreover the big bang nucleosynthesis constraints are satisfied too. The efficiency of inflation from fermions with curvature-dependent mass, at both the background and perturbation level, reveals the capabilities of the scenario and makes it a good candidate for the description of nature.

Original languageEnglish
Article number043523
JournalPhysical Review D
Volume100
Issue number4
DOIs
StatePublished - 13 Aug 2019

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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