Perturbed recombination from inhomogeneous photon injection and application to accreting primordial black holes
Perturbed recombination from inhomogeneous photon injection and application to accreting primordial black holes
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非均匀光子注入的扰动重组及其在吸积原初黑洞中的应用
DOI:
10.1103/physrevd.104.063534
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发表时间:
2021
影响因子:
5
通讯作者:
Ali-Haïmoud, Yacine
中科院分区:
文献类型:
--
作者:
Jensen, Trey W.;Ali-Haïmoud, Yacine
Exotic electromagnetic energy injection in the early Universe may alter cosmological recombination, and ultimately cosmic microwave background (CMB) anisotropies. Moreover, if energy injection is inhomogeneous, it may induce a spatially varying ionization fraction, and non-Gaussianity in the CMB. The observability of these signals, however, is contingent upon how far the injected particles propagate and deposit their energy into the primordial plasma, relative to the characteristic scale of energy injection fluctuations. In this study we inspect the spatial properties of energy deposition and perturbed recombination resulting from an inhomogeneous energy injection of sub-10 MeV photons, relevant to accreting primordial black holes (PBHs). We develop a novel Monte Carlo radiation transport code accounting for all relevant photon interactions in this energy range, and including secondary electron energy deposition efficiency through a new analytic approximation. For a specified injected photon spectrum, the code outputs an injection-to-deposition Green’s function depending on time and distance from the injection point. Combining this output with a linearized solution of the perturbed recombination problem, we derive time- and scale-dependent deposition-to-ionization Green’s functions. We apply this general framework to accreting PBHs, whose luminosity is strongly spatially modulated by supersonic relative velocities between cold dark matter and baryons. We find that the resulting spatial fluctuations of the free-electron fraction are of the same magnitude as its mean deviation from standard recombination, from which current CMB power spectra constraints are derived. This work suggests that the sensitivity to accreting PBHs might be substantially improved by propagating these inhomogeneities to CMB anisotropy power spectra and non-Gaussian statistics, which we study in subsequent papers.
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DOI:
--
发表时间:
2011
期刊:
影响因子:
--
作者:
Y. Ali
通讯作者:
Y. Ali
DOI:
--
发表时间:
2009
期刊:
影响因子:
--
作者:
J. Chluba;R. Sunyaev
通讯作者:
R. Sunyaev
DOI:
10.1086/378763
发表时间:
2003-02
期刊:
The Astrophysical Journal Letters
影响因子:
--
作者:
N. Afshordi;P. Mcdonald;D. Spergel
通讯作者:
N. Afshordi;P. Mcdonald;D. Spergel
DOI:
10.1111/j.1365-2966.2010.16401.x
发表时间:
2009
影响因子:
4.8
作者:
S. Furlanetto;Samuel Johnson Stoever
通讯作者:
Samuel Johnson Stoever
DOI:
--
发表时间:
1979
期刊:
影响因子:
--
作者:
Z. A. Ajtekeeva
通讯作者:
Z. A. Ajtekeeva