SPACE, TIME AND FUNDAMENTAL INTERACTIONS

Binary supermassive primordial black holes

Eroshenko Yu. N., Stasenko V. D.

The change in the orbit of binary supermassive primordial black holes in the common evolving halo of dark matter is investigated. It is shown that the passage of dark matter layers through the pair leads to an acceleration of the orbit compression. This effect increases the rate of mergers of the binary systems and, consequently, the rate of gravitational wave bursts. To explain the Nanograv data by the process of mergers of binary primordial black holes, it is necessary to assume that in early epochs there was a deterministic mechanism for the formation of such pairs, since the number of black holes that happened to be nearby is insufficient for this. Nevertheless, the presence of such a deterministic mechanism cannot be ruled out, for example, in the model with collapses of domain walls (the Khlopov–Rubin–Sakharov model). We also discuss the possible process of accelerated merge of black holes in pairs in a model with the self-interaction of dark matter particles.