Constraints on Primordial Black Holes by Distortions of Cosmic Microwave Background
| dc.creator | Tashiro, Hiroyuki | |
| dc.creator | Sugiyama, Naoshi | |
| dc.date | 2008-01-21 | |
| dc.date | 2008-07-11 | |
| dc.date.accessioned | 2026-07-07T11:39:57Z | |
| dc.date.available | 2026-07-07T11:39:57Z | |
| dc.description | Possible influence of primordial black hole (PBH) evaporations on cosmic microwave background (CMB) is investigated. The spectrum distortions of CMB from the black-body spectrum are described by the chemical potential $μ$ and the Compton parameter $y$. From COBE/FIRAS limits on $μ$ and $y$, the power law index $n$ of primordial density fluctuations and the mass fraction of PBHs $β$ 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 $ζ_{\rm th} =0.7$ and $ζ_{\rm th} =1.2$, respectively, for the PBH mass range between $2.7\times 10^{11}$g and $1.6 \times 10^{12}$g, and $n < 1.312$ and $n<1.343$ in the thresholds of peaks $ζ_{\rm th} =0.7$ and $ζ_{\rm th} =1.2$, respectively, for the PBH mass range between $1.6 \times 10^{12} {\rm g}$ and $3.5\times 10^{13}$g, which correspond to the comoving scales between $3 \times 10^{-18}$Mpc and $ 4\times 10^{-17}$Mpc. The constraint on the PBH fraction, which is the direct probe of the amplitude of density fluctuations in these scales, stays an almost same value as $β<10^{-21}$ in these mass ranges. It is also found that, with these constraints, UV photons injected by PBH evaporations are unlikely ionize vast hydrogen atoms after recombination. | |
| dc.description | accepted for publication in Phys.Rev.D | |
| dc.identifier | https://arxiv.org/abs/0801.3172 | |
| dc.identifier | http://arxiv.org/abs/0801.3172 | |
| dc.identifier | Phys.Rev.D78:023004,2008 | |
| dc.identifier | doi:10.1103/PhysRevD.78.023004 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/200105 | |
| dc.subject | Astrophysics | |
| dc.title | Constraints on Primordial Black Holes by Distortions of Cosmic Microwave Background | |
| dc.type | text |