Spins of Primordial Black Holes Formed in the Radiation-dominated Phase of the Universe: First-order Effect
نویسندگان
چکیده
The standard deviation of the initial values nondimensional Kerr parameter a* primordial black holes (PBHs) that formed in radiation-dominated phase universe is estimated to first order perturbation for narrow power spectrum. Evaluating angular momentum at turnaround based on linearly extrapolated transfer functions and peak theory, we obtain expression , where MH, ?0(MH), ? are mass within Hubble horizon entry overdense region, fraction which collapsed PBHs scale a quantity characterizes width spectrum, respectively. This implies M ? higher probability PBH formation, larger spins, while ? MH through near-critical collapse may have spins than those MH. In comparison previous estimate, new estimate has an explicit dependence ratio M/MH no direct current dark matter density. On other hand, it suggests first-order effect can be numerically comparable second-order one.
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ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 2021
ISSN: ['2041-8213', '2041-8205']
DOI: https://doi.org/10.3847/1538-4357/abd9b9