1998/02/28 by T. Asaka, Jiro Hashiba, J. Hashiba +3 · 2 citations
Physics and Astronomy · #Astrophysics #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #Dark matter #Galaxy #Halo #Moduli #Optics #Particle physics theoretical and experimental studies #Photon #Photon energy #Physics #Quantum mechanics #Spectrum (functional analysis) #astro-ph #hep-ph
paper · pdf · doi:10.1103/physrevd.58.023507
published as Phys.Rev.D58:023507,1998 · 14 pages (RevTeX file) including four postscript figures, reviced version to be published in Physical Review D
openalex publication_date 1998/06/25 · arxiv created 1998/07/16 · arxiv updated 2010/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We examine the x-ray spectrum from the decay of dark-matter moduli with mass \ensuremath∼100keV, in particular, paying attention to the line spectrum from the moduli trapped in the halo of our galaxy. It is found that with the energy resolution of the current experiments (\ensuremath∼10%) the line intensity is about twice as strong as that of the continuum spectrum from the moduli that spread in the whole universe. Therefore, in future experiments with higher energy resolutions it may be possible to detect such line photons. We also investigate the \ensuremathγ-ray spectrum emitted from the decay of the multi-GeV moduli. It is shown that the emitted photons may form a MeV bump in the \ensuremathγ-ray spectrum. We also find that if the modulus mass is of the order of 10 GeV, the emitted photons at the peak of the continuum spectrum lose their energy by scattering and the shape of the spectrum is significantly changed, which makes the constraint weaker than that obtained in previous works.