2005/09/23 by Luca Amendola, Riccardo Barbieri · 9 citations
Physics and Astronomy · #Astrophysics #Boson #Cosmic microwave background #Cosmology #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #Dark energy #Dark matter #Fermion #Goldstone boson #Hot dark matter #Light dark matter #Neutrino #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum mechanics #Scalar field #Scalar field dark matter #astro-ph #hep-ph
paper · pdf · doi:10.1016/j.physletb.2006.08.069
published as Phys.Lett.B642:192-196,2006 · 11 pages, 4 figures
arxiv created 2005/09/23 · openalex publication_date 2006/09/26 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Dark Matter (DM) and Dark Energy (DE) can be both described in terms of ultra-light Pseudo-Goldstone-Bosons (PGB) with masses mDM ~ 10-23eV and mDE <= 10-33eV respectively. Following Barbieri et al, we entertain the possibility that a PGB exists with mass mI intermediate between these two limits, giving a partial contribution to DM. We evaluate the related effects on the power spectrum of the matter density perturbations and on the cosmic microwave background and we derive the bounds on the density fraction, fI, of this intermediate field from current data, with room for a better sensitivity on fI in the near future. We also give a simple and unified analytic description of the free streaming effects both for an ultra-light scalar and for a massive neutrino.