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

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Title: Impacts of WIMP dark matter upon stellar evolution: main-sequence stars
Authors: Scott, P
Fairbairn, M
Edsjö, J
Item Type: Conference Paper
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.
Issue Date: 1-Dec-2008
URI: http://hdl.handle.net/10044/1/54138
Start Page: 073
Journal / Book Title: PoS IDM
Volume: 2008
Copyright Statement: © 2008 Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike Licence.
Keywords: astro-ph
hep-ph
Notes: 4 pages, 2 figures. To appear in the proceedings of the Identification of Dark Matter conference (IDM 2008), Stockholm, Sweden, 18-22 August, 2008
Appears in Collections:Physics
Astrophysics
Faculty of Natural Sciences



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