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arXiv:0810.5560 (astro-ph)
[Submitted on 30 Oct 2008]

Title:Impacts of WIMP dark matter upon stellar evolution: main-sequence stars

Authors:Pat Scott, Malcolm Fairbairn, Joakim Edsjö
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Abstract: The presence of large amounts of WIMP dark matter in stellar cores has been shown to have significant effects upon models of stellar evolution. We present a series of detailed grids of WIMP-influenced stellar models for main sequence stars, computed using the DarkStars code. We describe the changes in stellar structure and main sequence evolution which occur for masses ranging from 0.3 to 2.0 solar masses and metallicities from Z = 0.0003-0.02, as a function of the rate of energy injection by WIMPs. We then go on to show what rates of energy injection can be obtained using realistic orbital parameters for stars near supermassive black holes, including detailed considerations of dark matter halo velocity and density profiles. Capture and annihilation rates are strongly boosted when stars follow elliptical rather than circular orbits, causing WIMP annihilation to provide up to 100 times the energy of hydrogen fusion in stars at the Galactic centre.
Comments: 4 pages, 2 figures. To appear in the proceedings of the Identification of Dark Matter conference (IDM 2008), Stockholm, Sweden, 18-22 August, 2008
Subjects: Astrophysics (astro-ph); High Energy Physics - Phenomenology (hep-ph)
Cite as: arXiv:0810.5560 [astro-ph]
  (or arXiv:0810.5560v1 [astro-ph] for this version)
  https://doi.org/10.48550/arXiv.0810.5560
Journal reference: PoS IDM2008:073,2008

Submission history

From: Patrick Scott [view email]
[v1] Thu, 30 Oct 2008 20:03:18 UTC (224 KB)
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