Interaction between bosonic dark matter and stars

Richard Brito, Vitor Cardoso, Caio F B Macedo, Hirotada Okawa, Carlos Palenzuela

Research output: Contribution to journalArticle

38 Citations (Scopus)

Abstract

We provide a detailed analysis of how bosonic dark matter "condensates" interact with compact stars, extending significantly the results of a recent Letter [1]. We focus on bosonic fields with mass mB, such as axions, axion-like candidates and hidden photons. Self-gravitating bosonic fields generically form "breathing" configurations, where both the spacetime geometry and the field oscillate, and can interact and cluster at the center of stars. We construct stellar configurations formed by a perfect fluid and a bosonic condensate, and which may describe the late stages of dark matter accretion onto stars, in dark-matter-rich environments. These composite stars oscillate at a frequency which is a multiple of f=2.5×1014(mBc2/eV) Hz. Using perturbative analysis and numerical relativity techniques, we show that these stars are generically stable, and we provide criteria for instability. Our results also indicate that the growth of the dark matter core is halted close to the Chandrasekhar limit. We thus dispel a myth concerning dark matter accretion by stars: dark matter accretion does not necessarily lead to the destruction of the star, nor to collapse to a black hole. Finally, we argue that stars with long-lived bosonic cores may also develop in other theories with effective mass couplings, such as (massless) scalar-tensor theories.

Original languageEnglish
Article number044045
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume93
Issue number4
DOIs
Publication statusPublished - 2016 Feb 16

    Fingerprint

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this