2005/05/31 by Edmund J. Copeland, Osamu Seto · 3 citations
Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #Galaxies: Formation, Evolution, Phenomena #astro-ph #hep-ph #hep-th
paper · pdf · doi:10.1103/physrevd.72.023506
published as Phys.Rev. D72 (2005) 023506 · 24pages
openalex publication_date 2005/07/08 · arxiv created 2005/07/19 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We consider the constraints that can be imposed on a wide class of Inflation models in modified gravity scenarios in which the Friedmann equation is modified by the inclusion of \ensuremathρ2 terms, where \ensuremathρ is the total energy density. In particular we obtain the reheating temperature and gravitino abundance associated with the end of inflation. Whereas models of chaotic inflation and natural inflation can easily avoid the conventional gravitino overproduction problem, we show that supersymmetric hybrid inflation models (driven by both F and D terms) do not work in the \ensuremathρ2 dominated era. We also study inflation driven by exponential potentials in this modified background and show that the gravitino production is suppressed enough to avoid there being a problem, although other conditions severely constrain these models.