2004/03/31 by Rouzbeh Allahverdi
Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #astro-ph #hep-ph
paper · pdf · doi:10.1103/physrevd.70.043507
published as Phys.Rev. D70 (2004) 043507 · 12 pages, 3 figures. Final version to appear in Phys. Rev. D
arxiv created 2004/07/15 · openalex publication_date 2004/08/09 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
In an alternative mechanism recently proposed, adiabatic cosmological perturbations are generated at the decay of the inflaton field due to small fluctuations of its coupling to matter. This happens whenever the coupling is governed by the vacuum expectation value of another field, which acquires fluctuations during inflation. We discuss generalization and various possible implementations of this mechanism, and present some specific particle physics examples. In many cases the second field can start oscillating before perturbations are imprinted, or survive long enough so to dominate over the decay products of the inflaton. The primordial perturbations will then be modified accordingly in each case.