2018/06/30 by Jiawei Liao, Z. H. Liao, S. P. Miao +1 · 1 citation
Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #Inflation (cosmology) #Physics #Theoretical physics #astro-ph.CO #gr-qc
paper · pdf · doi:10.1103/physrevd.99.103522
published as Phys. Rev. D 99, 103522 (2019) · 11 pages, 3 figures, uses LaTeX2e Version 2 extensively revised for publication, contains a new section connecting reheating and fine tuning and an extended discussion of the late time de Sitter phase approached by all fermion models
openalex created_date 2018/06/13 · openalex publication_date 2019/05/16 · arxiv created 2019/05/21 · arxiv updated 2019/05/22 · openalex updated_date 2026/08/06
We consider an additional fine-tuning problem which afflicts scalar-driven models of inflation. The problem is that successful reheating requires the inflaton be coupled to ordinary matter, and quantum fluctuations of this matter induce Coleman-Weinberg potentials which are not Planck suppressed. Unlike the flat space case, these potentials depend upon a still-unknown, nonlocal functional of the metric which reduces to the Hubble parameter for de Sitter. Such a potential cannot be completely subtracted off by any local action. In a simple model we numerically consider one possible subtraction scheme in which the correction is locally subtracted at the beginning of inflation. For fermions the effect is to make the Universe approach de Sitter with a smaller Hubble parameter. For gauge bosons the effect is to make inflation end almost instantly unless the gauge charge is unacceptably small.