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arXiv · 1905.03731

Inflation from fermions with curvature-dependent mass

David Benisty·Eduardo I. Guendelman·Emmanuel N. Saridakis·Horst Stoecker·Jurgen Struckmeier·David Vasak
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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 decreased curvature-dependent fermion mass. Through the perturbation level, we obtain the scalar spectral index and the tensor-to-scalar ratio, which are in agreement with the Planck observations. 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.

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David Benisty, Eduardo I. Guendelman, Emmanuel N. Saridakis, Horst Stoecker, Jurgen Struckmeier, David Vasak. 2019-08-01. Inflation from fermions with curvature-dependent mass. https://doi.org/10.1103/physrevd.100.043523

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