Antistars or Antimatter Cores in Mirror Neutron Stars?

The oscillation of the neutron n into mirror neutron n ', its partner from the dark mirror sector, can gradually transform an ordinary neutron star into a mixed star consisting in part of mirror dark matter. The implications of the reverse process taking place in the mirror neutron stars depend on the sign of baryon asymmetry in the mirror sector. Namely, if it is negative, as predicted by certain baryogenesis scenarios, then n ' over bar-n over bar transitions create a core of our antimatter gravitationally trapped in the mirror star interior. The annihilation of accreted gas on such antimatter cores could explain the origin of gamma-source candidates with an unusual spectrum compatible with baryon-antibaryon annihilation, recently identified in the Fermi LAT catalog. In addition, some part of this antimatter escaping after the mergers of mirror neutron stars can produce the flux of cosmic antihelium and also heavier antinuclei which are hunted in the AMS-02 experiment.

Automated summary

This article discusses the oscillation of neutron n into mirror neutron n ' and the transformation of an ordinary neutron star into a mixed star, as well as the potential implications of the reverse process occurring in mirror neutron stars, particularly in relation to baryon asymmetry. It also highlights the presence of antimatter in mirror neutron stars and the potential pathways for its production.