Cosmic microwave background bounds on primordial black holes including dark matter halo accretion

By P. Serpico, V. Poulin, D. Inman, K. Kohri. 2020

178 citations recorded by the source corpus.

Even if massive ($10\,M_\odot \lesssim M \lesssim 10^4 M_\odot$) primordial black holes (PBHs) can only account for a small fraction of the dark matter (DM) in the universe, they may still be responsible for a sizable fraction of the coalescence events measured by LIGO/Virgo, and/or act as progenitors of the supermassive black holes (SMBHs) observed already at high redshift ($z\gtrsim 6$). In presence of a dominant, non-PBH DM component, the bounds set by CMB via an altered ionization history are modified. We revisit the cosmological accretion of a DM halo around PBHs via toy models and dedicated numerical simulations, deriving updated CMB bounds which also take into account the last Planck data release. We prove that these constraints dominate over other constraints available in the literature at masses $M\gtrsim 20-50\,M_\odot$ (depending on uncertainty in accretion physics), reaching the level $f_{\rm PBH}<3\times 10^{-9}$ around $M\sim 10^{4}\,M_\odot$. These tight bounds are nonetheless consistent with the hypothesis of a primordial origin of the SMBH massive seeds.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/1aaf88879346bfab9102e100a6e02f2e5037b9a2

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Astronomy and Astrophysics

1. Florian Kuhnel
2. B. Carr
3. K. Kohri
4. T. Terada
5. G. Franciolini
6. A. Riotto
7. V. D. Luca
8. O. Mena

In Nuclear and High Energy Physics

1. Florian Kuhnel
2. B. Carr
3. K. Kohri
4. T. Terada
5. A. Riotto
6. G. Franciolini
7. O. Mena
8. S. Palomares-Ruiz

Citations in the corpus

• Primordial black holes confront LIGO/Virgo data: current situation (2020, background): “Other constraints involve bounds from Planck data on the CMB anisotropies induced by X-rays emitted by spherical or disk (Planck S and Planck D, respectively) [52, 101] accretion at high redshifts or bounds on the observed number of X-ray (XRay) [102, 103] and X-ray binaries (XRayB) at low redshifts”
• Primordial black holes as dark matter candidates (2021, background): “[157, 158] argue that the spherical accretion approximation probably breaks down, with an accretion disk forming instead.”
• A Brief Review on Primordial Black Holes as Dark Matter (2021, background): “Taking into account that PBHs could be immersed in DM halos with higher densities than the background, their accretion rates would be increased, also leading to more stringent constraints (Serpico et al., 2020).”
• Primordial Black Holes as Dark Matter: Recent Developments (2020, background): “[204, 205] argue that the spherical accretion approximation probably breaks down, with an accretion disk forming instead, and this affects the statistical properties of the CMB anisotropies.”
• Solar-mass primordial black holes explain NANOGrav hint of gravitational waves (2020, background): “These include the microlensing constraints by EROS/MACHO collaborations [78, 79], the caustic crossing constraint [80], Advanced LIGO constraints on the subsolar mass range (individual events [81] and superposition of events [82, 83]), and the constraints due to photo-emission during gas accretion o”