Inflation from fermions

by David Benisty

Ben-Gurion University

at Particles and Fields Seminar

Mon, 04 Nov 2019, 14:00
Sacta-Rashi Building for Physics (54), room 207

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 BBN 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.

Created on 28-10-2019 by Kats, Yevgeny (katsye)
Updaded on 28-10-2019 by Kats, Yevgeny (katsye)