Scalar field dark matter with spontaneous symmetry breaking and the 3.5 keV line

• Tipo: Artigo em Revista Científica Internacional
• Data: 2018

Autores

Cosme, C (Autor) Outra; Rosa, JG (Autor) Outra; Bertolami, O (Autor) FCUP

Revista

Título: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

Vol. 781

Páginas: 639-644

ISSN: 0370-2693

Editora: Elsevier

Indexação

ISI Web of Knowledge - 18 Citações

Scopus - 18 Citações

Outras Informações

ID Authenticus: P-00N-XQ8

DOI: 10.1016/j.physletb.2018.04.062

Abstract (EN): We show that the present dark matter abundance can be accounted for by an oscillating scalar field that acquires both mass and a non-zero expectation value from interactions with the Higgs field. The dark matter scalar field can be sufficiently heavy during inflation, due to a non-minimal coupling to gravity, so as to avoid the generation of large isocurvature modes in the CMB anisotropies spectrum. The field begins oscillating after reheating, behaving as radiation until the electroweak phase transition and afterwards as non-relativistic matter. The scalar field becomes unstable, although sufficiently long-lived to account for dark matter, due to mass mixing with the Higgs boson, decaying mainly into photon pairs for masses below the MeV scale. In particular, for a mass of similar to 7 keV, which is effectively the only free parameter, the model predicts a dark matter lifetime compatible with the recent galactic and extragalactic observations of a 3.5 keV X-ray line. (C) 2018 The Authors. Published by Elsevier B.V.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 6