2006/05/31 by Masahiro Kawasaki, Fuminobu Takahashi, Tsutomu T. Yanagida +1 · 3 citations
Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #Particle physics theoretical and experimental studies #astro-ph #hep-ph #hep-th
paper · pdf · doi:10.1103/physrevd.74.043519
published as Phys.Rev. D74 (2006) 043519 · 34 pages, 7 figures. v2: minor corrections
openalex publication_date 2006/08/16 · arxiv created 2006/08/18 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We show that the gravitino-overproduction problem is prevalent among inflation models in supergravity. An inflaton field \ensuremathφ generically acquires (effective) nonvanishing auxiliary field G_\ensuremathΦ(eff), if the K"ahler potential is nonminimal. The inflaton field then decays into a pair of the gravitinos. We extensively study the cosmological constraints on G_\ensuremathΦ(eff) for a wide range of the gravitino mass. For many inflation models we explicitly estimate G_\ensuremathΦ(eff), and show that the gravitino-overproduction problem severely constrains the inflation models, unless such an interaction as K=\ensuremathκ/2|\ensuremathφ|2z2+H.c. is suppressed (here z is the field responsible for the supersymmetry breaking). We find that many of them are already excluded or on the verge of, if \ensuremathκ\ensuremath∼O(1).