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Astrophysics > High Energy Astrophysical Phenomena

arXiv:2106.11203 (astro-ph)
[Submitted on 21 Jun 2021]

Title:Antistars or antimatter cores in mirror neutron stars?

Authors:Zurab Berezhiani
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Abstract:The oscillation of the neutron $n$ into mirror neutron $n'$, its partner from 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 mirror sector. Namely, if it is negative, as predicted by certain baryogenesis scenarios, then $\bar{n}'-\bar{n}$ 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 $\gamma$-source candidates, with unusual spectrum compatible to 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.
Comments: 11 pages
Subjects: High Energy Astrophysical Phenomena (astro-ph.HE); Cosmology and Nongalactic Astrophysics (astro-ph.CO); High Energy Physics - Phenomenology (hep-ph); Nuclear Theory (nucl-th)
Cite as: arXiv:2106.11203 [astro-ph.HE]
  (or arXiv:2106.11203v1 [astro-ph.HE] for this version)
  https://doi.org/10.48550/arXiv.2106.11203

Submission history

From: Zurab Berezhiani [view email]
[v1] Mon, 21 Jun 2021 15:41:46 UTC (45 KB)
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