Primordial Black Holes having Gravitomagnetic Monopole

TL;DR

This paper explores how gravitomagnetic monopoles could influence primordial black hole evaporation, suggesting that low-energy PBHs might still exist if they contain gravitomagnetic monopoles, which could be detectable in future observations.

Contribution

It introduces the concept that gravitomagnetic monopoles can affect PBH evaporation, proposing a new way to identify such monopoles through low-energy PBH detection.

Findings

Low-energy PBHs could exist if they contain gravitomagnetic monopoles.

Detection of certain low-energy PBHs may imply the presence of gravitomagnetic monopoles.

Gravitomagnetic monopoles might leave remnants as pseudo 'mass-energy' in PBHs.

Abstract

A primordial black hole (PBH) is thought to be made of the regular matter or ordinary mass ($M$) only, and hence could have already been decayed due to the Hawking radiation if its initial ordinary mass were $\lesssim 5 \times 10^{11}$ kg. Here, we study the role of gravitomagnetic monopole for the evaporation of PBHs, and propose that the lower energy PBHs (equivalent to ordinary mass $M << 5\times 10^{11}$ kg) could still exist in our present Universe, if it has gravitomagnetic monopole. If a PBH was initially made of both regular matter and gravitomagnetic monopole, the regular matter could decay away due to the Hawking radiation. The remnant gravitomagnetic monopole might not entirely decay, which could still be found as a PBH in the form of the pseudo `mass-energy'. If a PBH with $M \gtrsim 5 \times 10^{11}$ kg is detected, one may not be able to conclude if it has gravitomagnetic monopole. But, a plausible detection of a relatively low energy (equivalent to $2.176 \times 10^{-8}$ kg $< M \lesssim 5\times10^{11}$ kg) PBH in future may imply the existence of a gravitomagnetic monopole PBH, which may or may not contain the ordinary mass.