2018/07/31 by S. A. Bonometto, R. Mainini, Roberto Mainini +1 · 11 citations
Physics and Astronomy · #Astrophysics #Black Holes and Theoretical Physics #Cosmology #Cosmology and Gravitation Theories #Dark energy #Dark matter #Galaxies: Formation, Evolution, Phenomena #Gravitational wave #Higgs boson #Mathematical physics #Particle physics #Physics #Primordial black hole #Quantum mechanics #Radiative transfer #Scalar (mathematics) #Scalar field #Spinor #astro-ph.CO
paper · pdf · doi:10.1093/mnras/stz846
published in Monthly Notices of the Royal Astronomical Society 486(2), 2321-2335 (Oxford University Press) · 15 pages, 15 figures; accepted for publication in MNRAS. Updated to match accepted version
openalex created_date 2018/08/22 · openalex publication_date 2019/03/21 · arxiv created 2019/04/09 · arxiv updated 2019/04/10 · openalex updated_date 2026/08/05
Large primordial black hole (PBH) formation is enhanced if strongly coupled scalar and spinor fields (Φ and ψ) are a stable cosmic component since the primeval radiative expansion (SCDEW models). In particular, we show that PBH formation is easier at a specific time, i.e. when the asymptotic mass mH, acquired by the ψ field at the higgs scale, becomes dominant, so that the typical BH mass MBH depends on mH value. For instance, if |m_ H ∼ 100 | eV (1 keV) and the coupling β ∼ 8.35 (37), PBH with MBH ≃ 107–|108 M_\odot| (∼103–|104 M_\odot|) could form. The very mechanism enhancing PBH formation also causes technical difficulties to evaluate the transfer function of SCDEW models at high k. A tentative solution of this problem leaves only minor discrepancies from Lambda cold dark matter (ΛCDM), also at these scales, gradually vanishing for greater mH values. We conclude that, for suitable parameter choices, SCDEW models could be the real physics underlying ΛCDM, overcoming its fine-tuning and coincidence problems, with the extra bonus of yielding large BH seeds.