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Title:
Effect of Primordial Black Holes on the Cosmic Microwave Background and Cosmological Parameter Estimates
Authors:
Ricotti, Massimo; Ostriker, Jeremiah P.; Mack, Katherine J.
Affiliation:
AA(Department of Astronomy, University of Maryland, College Park, MD 20742 ), AB(Department of Astrophysical Sciences, Princeton University, Peyton Hall, Ivy Lane, Princeton, NJ 08544), AC(Department of Astrophysical Sciences, Princeton University, Peyton Hall, Ivy Lane, Princeton, NJ 08544)
Publication:
The Astrophysical Journal, Volume 680, Issue 2, pp. 829-845. (ApJ Homepage)
Publication Date:
06/2008
Origin:
UCP
Astronomy Keywords:
Black Hole Physics, Cosmology: Cosmic Microwave Background, Cosmology: Observations, Cosmology: Theory, Cosmology: Cosmological Parameters, Cosmology: Early Universe
DOI:
10.1086/587831
Bibliographic Code:
2008ApJ...680..829R

Abstract

We investigate the effect of nonevaporating primordial black holes (PBHs) on the ionization and thermal history of the universe. X-rays emitted by gas accretion onto PBHs modify the cosmic recombination history, producing measurable effects on the spectrum and anisotropies of the cosmic microwave background (CMB). Using the third-year WMAP data and COBE FIRAS data we improve existing upper limits on the abundance of PBHs with masses >0.1 Msolar by several orders of magnitude. The new upper limits still allow PBHs to be important for the origin of supermassive black holes and ultraluminous X-ray sources. Fitting WMAP3 data with cosmological models that do not allow for nonstandard recombination histories, as produced by PBHs or other early energy sources, may lead to an underestimate of the best-fit values of the amplitude of linear density fluctuations (σ8) and the scalar spectral index (ns). Cosmological parameter estimates are affected because models with PBHs allow for larger values of the Thomson scattering optical depth, whose correlation with other parameters may not be correctly taken into account when PBHs are ignored. Values of τe~0.2, ns~1, and σ8~0.9 are allowed at 95% CF. This result may relieve recent tension between WMAP3 data and clusters data on the value of σ8. PBHs may increase the primordial molecular hydrogen abundance by up to 2 orders of magnitude, this promoting cooling and star formation. The suppression of galaxy formation due to X-ray heating is negligible for models consistent with the CMB data. Thus, the formation rate of the first galaxies and stars would be enhanced by a population of PBHs.
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