2019/05/31 by David Benisty, Eduardo Guendelman, Eduardo I. Guendelman +5 · 30 citations
Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmological perturbation theory #Cosmology and Gravitation Theories #Curvature #Fermion #Galaxies: Formation, Evolution, Phenomena #Inflation (cosmology) #Mathematical physics #Particle physics #Physics #Quantum mechanics #Scalar (mathematics) #Scalar curvature #Spectral index #Spectral line #Theoretical physics #astro-ph.CO #gr-qc #hep-th
paper · pdf · doi:10.1103/physrevd.100.043523
published in Physical review. D/Physical review. D. 100(4) (American Physical Society) · 6 pages; 2 Fig; Accepted for publishing in Phys.Rev.D
arxiv created 2019/08/01 · openalex publication_date 2019/08/13 · arxiv updated 2019/08/15 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
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.