2004/09/28 by Leonida Gianfagna, L. Gianfagna, Maurizio Giannotti +3 · 1 citation
Physics and Astronomy · #Astronomy #Astrophysics #Astrophysics and Cosmic Phenomena #Axion #Dark Matter and Cosmic Phenomena #Dark matter #Electron #Exponential decay #Gamma-ray burst #Gravitation #Gravitational wave #Nuclear physics #Parameter space #Particle physics #Particle physics theoretical and experimental studies #Physics #astro-ph #hep-ph
paper · pdf · doi:10.1088/1126-6708/2004/10/044
published as JHEP0410:044,2004 · 20 pages, 5 eps figures, added footnote and references
arxiv created 2004/09/28 · openalex publication_date 2004/10/19 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
A modification of the relation between axion mass and the PQ constant permits a relaxation of the astrophysical constraints, considerably enlarging the allowed axion parameter space. We develop this idea in this paper, discussing a model for an \it ultramassive axion, which essentially represents a supersymmetric Weinberg-Wilczek axion of the mirror world. The experimental and astrophysical limits allow a PQ scale fa ~ 104-106 GeV and a mass ma ~ 1MeV, which can be accessible for future experiments. On a phenomenological ground, such an \it ultramassive axion turns out to be quite interesting. It can be produced during the gravitational collapse or during the merging of two compact objects, and its subsequent decay into e+e- provides an efficient mechanism for the transfer of the gravitational energy of the collapsing system to the electron-positron plasma. This could resolve the energy budget problem in the Gamma Ray Bursts and also help in understanding the SN type II explosion phenomena.