Primordial intermediate-mass binary black holes in space laser interferometers

Primordial black holes (PBHs) with log-normal mass distributions reaching obtained $\sim 10^4$–$10^5$ solar masses may form following the quantum chromodynamic (QCD) phase transition in the early Universe, potentially due to modified Affleck–Dine baryogenesis. The expected frequency of detection of binary PBHs with intermediate masses using the TianQin space laser interferometer has been calculated based on the model of binary PBH formation and the assumed parameters of the log-normal distribution of primordial black holes. The obtained results are consistent with the LIGO-Virgo-KAGRA (LVK) data.