On the capture of dark matter by neutron stars

Tolga Güver, Arif Emre Erkoca, Mary Hall Reno, Ina Sarcevic

Research output: Contribution to journalArticle

34 Scopus citations

Abstract

We calculate the number of dark matter particles that a neutron star accumulates over its lifetime as it rotates around the center of a galaxy, when the dark matter particle is a self-interacting boson but does not self-annihilate. We take into account dark matter interactions with baryonic matter and the time evolution of the dark matter sphere as it collapses within the neutron star. We show that dark matter self-interactions play an important role in the rapid accumulation of dark matter in the core of the neutron star. We consider the possibility of determining an exclusion region of the parameter space for dark matter mass and dark matter interaction cross section with the nucleons as well as dark matter self-interaction cross section, based on the observation of old neutron stars. We show that for a dark matter density of 103 GeV/cm3and dark matter mass mχ 10 GeV, there is a potential exclusion region for dark matter interactions with nucleons that is three orders of magnitude more stringent than without self-interactions. The potential exclusion region for dark matter self-interaction cross sections is many orders of magnitude stronger than the current Bullet Cluster limit. For example, for high dark matter density regions, we find that for mχ∼ 10 GeV when the dark matter interaction cross section with the nucleons ranges from σ χn ∼ 10 -52 cm2 to σ χn ∼ 10-57 cm 2, the dark matter self-interaction cross section limit is σ χχ 10-33 cm2, which is about ten orders of magnitude stronger than the Bullet Cluster limit.

Original languageEnglish (US)
Article number013
JournalJournal of Cosmology and Astroparticle Physics
Volume2014
Issue number5
DOIs
StatePublished - May 2014

Keywords

  • dark matter experiments
  • dark matter theory
  • neutron stars

ASJC Scopus subject areas

  • Astronomy and Astrophysics

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