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Title: Constraints on primordial black holes by distortions of the cosmic microwave background

Abstract

The possible influence of primordial black hole (PBH) evaporations on cosmic microwave backgrounds (CMB) is investigated. The spectrum distortions of CMB from the blackbody spectrum are described by the chemical potential {mu} and the Compton parameter y. From COBE/FIRAS limits on {mu} and y, the power-law index n of primordial density fluctuations and the mass fraction of PBHs {beta} are constrained by employing the peak theory for the formation process of PBHs. Constraints set here are n<1.304 and n<1.333 in the thresholds of peaks {zeta}{sub th}=0.7 and {zeta}{sub th}=1.2, respectively, for the PBH mass range between 2.7x10{sup 11} g and 1.6x10{sup 12} g, and n<1.312 and n<1.343 in the thresholds of peaks {zeta}{sub th}=0.7 and {zeta}{sub th}=1.2, respectively, for the PBH mass range between 1.6x10{sup 12} g and 3.5x10{sup 13} g, which correspond to the comoving scales between 3x10{sup -18} Mpc and 4x10{sup -17} Mpc. The constraint on the PBH fraction, which is the direct probe of the amplitude of density fluctuations on these scales, stays at almost the same value as {beta}<10{sup -21} in these mass ranges. It is also found that, with these constraints, UV photons injected by PBH evaporations are unlikely to ionize the majority of hydrogenmore » atoms.« less

Authors:
;  [1]
  1. Institut d'Astrophysique Spatiale, Universite Paris-Sud XI, Batiment 121, Orsay, F-91405 (France)
Publication Date:
OSTI Identifier:
21250308
Resource Type:
Journal Article
Journal Name:
Physical Review. D, Particles Fields
Additional Journal Information:
Journal Volume: 78; Journal Issue: 2; Other Information: DOI: 10.1103/PhysRevD.78.023004; (c) 2008 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0556-2821
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; AMPLITUDES; BLACK HOLES; DENSITY; FLUCTUATIONS; MASS; PHOTONS; RELICT RADIATION; SPECTRA

Citation Formats

Tashiro, Hiroyuki, Sugiyama, Naoshi, and Department of Physics and Astrophysics, Nagoya University, Chikusa-ku, Nagoya, 464-8602. Constraints on primordial black holes by distortions of the cosmic microwave background. United States: N. p., 2008. Web. doi:10.1103/PHYSREVD.78.023004.
Tashiro, Hiroyuki, Sugiyama, Naoshi, & Department of Physics and Astrophysics, Nagoya University, Chikusa-ku, Nagoya, 464-8602. Constraints on primordial black holes by distortions of the cosmic microwave background. United States. doi:10.1103/PHYSREVD.78.023004.
Tashiro, Hiroyuki, Sugiyama, Naoshi, and Department of Physics and Astrophysics, Nagoya University, Chikusa-ku, Nagoya, 464-8602. Tue . "Constraints on primordial black holes by distortions of the cosmic microwave background". United States. doi:10.1103/PHYSREVD.78.023004.
@article{osti_21250308,
title = {Constraints on primordial black holes by distortions of the cosmic microwave background},
author = {Tashiro, Hiroyuki and Sugiyama, Naoshi and Department of Physics and Astrophysics, Nagoya University, Chikusa-ku, Nagoya, 464-8602},
abstractNote = {The possible influence of primordial black hole (PBH) evaporations on cosmic microwave backgrounds (CMB) is investigated. The spectrum distortions of CMB from the blackbody spectrum are described by the chemical potential {mu} and the Compton parameter y. From COBE/FIRAS limits on {mu} and y, the power-law index n of primordial density fluctuations and the mass fraction of PBHs {beta} are constrained by employing the peak theory for the formation process of PBHs. Constraints set here are n<1.304 and n<1.333 in the thresholds of peaks {zeta}{sub th}=0.7 and {zeta}{sub th}=1.2, respectively, for the PBH mass range between 2.7x10{sup 11} g and 1.6x10{sup 12} g, and n<1.312 and n<1.343 in the thresholds of peaks {zeta}{sub th}=0.7 and {zeta}{sub th}=1.2, respectively, for the PBH mass range between 1.6x10{sup 12} g and 3.5x10{sup 13} g, which correspond to the comoving scales between 3x10{sup -18} Mpc and 4x10{sup -17} Mpc. The constraint on the PBH fraction, which is the direct probe of the amplitude of density fluctuations on these scales, stays at almost the same value as {beta}<10{sup -21} in these mass ranges. It is also found that, with these constraints, UV photons injected by PBH evaporations are unlikely to ionize the majority of hydrogen atoms.},
doi = {10.1103/PHYSREVD.78.023004},
journal = {Physical Review. D, Particles Fields},
issn = {0556-2821},
number = 2,
volume = 78,
place = {United States},
year = {2008},
month = {7}
}