Massive primordial black holes in contemporary and young universe (old predictions and new data)

Abstract

The parameters of the original log-normal mass spectrum of primordial black holes (PBH) are adjusted based on the existing observational data on supermassive black holes in the galactic centers and the mass distribution of the near-solar mass black holes in the Galaxy. Together with the assumption that PBHs make all or a large mass fraction of the cosmological dark matter it allows to fix the parameters of the original mass spectrum. The predicted, in this way, number density of MACHOs is found to be about an order of magnitude below the observed value. Possible resolution of the controversy may be prescribed to non-isotropic and inhomogeneous distribution of MACHOs or to the two-maximum spectra of PBH.

Multi-messenger cosmology of new physics

“…This range may be within the reach of LIGO-VIRGO and future LISA detection of gravitational waves and this prediction may be of interest for interpretation of the recent results of the NANOGrav Collaboration [25]. The primordial origin of the observed massive and supermassive black holes [26] may find additional support in the recent detection by LIGO and VIRGO collaborations of gravitational wave signal from a binary black hole merging with total mass 150M odot [27], corresponding to the gap in the predicted BH masses from first massive stars, can evidence for primordial origin of massive BHs [28].…”

Multimessenger Probes for New Physics in Light of A. Sakharov’s Legacy in Cosmoparticle Physics

“…Astrophysical models cannot easily explain the formation of such massive black holes in the evolution of the first stars, especially if the mass exceeds the value above 50 M . On the other hand, massive and supermassive black holes may have primordial origins (see, e.g., [118] for review and references), as well as massive PBH clustering, facilitating binary formation. GW signal from a BBH coalescence with total mass 150 M , detected by LIGO and VIRGO collaborations [119], was recently considered as possible evidence for primordial origin of massive BHs [120].…”

BSM Cosmology from BSM Physics

“…Formed within the cosmological horizon, which was small in the early Universe, it can seem that PBHs should have mass much smaller, than Solar mass M . However, the mechanisms of PBH formation can provide formation of PBHs with stellar mass, and even larger than stellar up to the seeds for Active Galactic nuclei (AGN) [28,29,30].…”