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Primordial black holes (PBHs) with log-normal mass spectrum with masses up to \(\sim 10^4-10^5 M_\odot \) can be created after QCD phase transition in the early Universe at \(z\sim 10^{12}\) by modified Affleck-Dine baryogenesis. Using a model binary PBH formation, the expected detection rate of such binary intermediate-mass PBHs by the TianQin space laser interferometer is calculated to be from a few to hundreds events per year for the assumed parameters of the PBH log-normal mass spectrum and abundance consistent with LIGO-Virgo-KAGRA results. Distinctive features of such primordial IMBH mergings are vanishingly small effective spins, possible high redshifts \(z>20\) and lack of association with gas-rich regions or galaxies.

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Primordial Intermediate-Mass Binary Black Holes as Targets for Space Laser Interferometers

  • 会议论文

  • 发表日期：

    2025年

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  • Konstantin Postnov,
  • Ilya Chekh

摘要

Primordial black holes (PBHs) with log-normal mass spectrum with masses up to \(\sim 10^4-10^5 M_\odot \) can be created after QCD phase transition in the early Universe at \(z\sim 10^{12}\) by modified Affleck-Dine baryogenesis. Using a model binary PBH formation, the expected detection rate of such binary intermediate-mass PBHs by the TianQin space laser interferometer is calculated to be from a few to hundreds events per year for the assumed parameters of the PBH log-normal mass spectrum and abundance consistent with LIGO-Virgo-KAGRA results. Distinctive features of such primordial IMBH mergings are vanishingly small effective spins, possible high redshifts \(z>20\) and lack of association with gas-rich regions or galaxies.