$\mathcal{O}(10)M_{\odot }$ primordial black holes and string axion dark matter

Abstract

LIGO-Virgo collaboration has found black holes as heavy as $M\sim 30M_{\odot }$ through the detections of the gravitational waves emitted during their mergers. Primordial black holes (PBHs) produced by inflation could be an origin of such events. While it is tempting to presume that these PBHs constitute all Dark Matter (DM), there exists a number of constraints for PBHs with $\mathcal{O}(10)M_{\odot }$ which contradict with the idea of PBHs as all DM. Also, it is known that weakly interacting massive particle (WIMP) that is a common DM candidate is almost impossible to coexist with PBHs. These observations motivate us to pursue another candidate of DM. In this paper, we assume that the string axion solving the strong CP problem makes up all DM, and discuss the coexistence of string axion DM and inflationary PBHs for LIGO events.

12 pages, 8 figures; v2: published version

References in corpus (16)

• Primordial Black Holes as Dark Matter
• Limits on the Macho Content of the Galactic Halo from the EROS-2 Survey of the Magellanic Clouds
• Gravitational-wave sensitivity curves
• Discovering the QCD Axion with Black Holes and Gravitational Waves
• Cosmic microwave background limits on accreting primordial black holes
• The merger rate of primordial-black-hole binaries
• Primordial Black Holes and Slow-Roll Violation
• CMB bounds on disk-accreting massive Primordial Black Holes
• Calculating the mass spectrum of primordial black holes
• Stochastic gravitational waves associated with the formation of primordial black holes
• Microlensing and dynamical constraints on primordial black hole dark matter with an extended mass function
• The end of the MACHO era- revisited: new limits on MACHO masses from halo wide binaries
• Primordial seeds of supermassive black holes
• Testing scenarios of primordial black holes being the seeds of supermassive black holes by ultracompact minihalos and CMB $\mu$-distortions
• Silk damping at a redshift of a billion: a new limit on small-scale adiabatic perturbations
• Supermassive black holes formed by direct collapse of inflationary perturbations

Cited by in corpus (2)

• On Primordial Black Holes and secondary gravitational waves generated from inflation with solo/multi-bumpy potential
• PBH assisted search for QCD axion dark matter