Neutrino-Antineutrino Asymmetry around Rotating Black Holes

TL;DR

This paper explores how the gravitational interaction between fermion spin and curved space-time around rotating black holes can generate neutrino-antineutrino asymmetry in the universe, due to CPT violation.

Contribution

It demonstrates that rotating black holes induce a non-zero neutrino-antineutrino asymmetry via gravitational spin-curvature coupling, highlighting a novel mechanism for matter-antimatter imbalance.

Findings

Neutrino-antineutrino asymmetry can be generated around rotating black holes.

The gravitational interaction acts as a CPT-violating axial-vector term.

Asymmetry depends on the black hole's rotation and space-time curvature.

Abstract

Propagation of fermion in curved space-time generates gravitational interaction due to the coupling between spin of the fermion and space-time curvature. This gravitational interaction, which is an axial-vector appears as CPT violating term in the Lagrangian. It is seen that this space-time interaction can generate neutrino asymmetry in Universe. If the back-ground metric is spherically asymmetric, say, of a rotating black hole, this interaction is non-zero, thus the net difference to the number density of the neutrino and anti-neutrino is nonzero.