CMB constraints on primordial black hole dark matter

2016/12/31 by Daniel Aloni, Kfir Blum, Raphael Flauger · 1 citation
Physics and Astronomy · #astro-ph.CO

paper · pdf · doi:10.1088/1475-7516/2017/05/017

4 pages. v2: changed treatment of statistical averaging of relative bulk motion between pBHs and baryonic plasma

arxiv created 2017/04/15 · arxiv updated 2017/05/17

Abstract

We revisit cosmic microwave background (CMB) constraints on primordial black hole dark matter. Spectral distortion limits from COBE/FIRAS do not impose a relevant constraint. Planck CMB anisotropy power spectra imply that primordial black holes with m_BH\gtrsim 5~M_\odot are disfavored. However, this is susceptible to sizeable uncertainties due to the treatment of the black hole accretion process. These constraints are weaker than those quoted in earlier literature for the same observables.

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