Other
Scientific paper
Mar 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aps..apr.b7008z&link_type=abstract
American Physical Society, APS April Meeting 2012, March 31-Apr 3, 2012, abstract #B7.008
Other
Scientific paper
I study energy transport by asymmetric dark matter (ADM) in very low-mass stars and brown dwarfs in order to explore astrophysical signatures of ADM, which may not otherwise be amenable to indirect searches. ADM models have gained significant attention recently due to several hints of low-mass dark matter signals in direct search experiments alongside ever more restrictive constraints on WIMP dark matter from the Fermi Gamma-ray Space Telescope data. In viable models, the additional cooling of low-mass stellar cores can alter stellar properties. ADM with mass 4 Mx/GeV10 and a spin-dependent (spin-independent) cross section of σp^SD ˜10-37,^2 (σp^SI ˜10-40,^2) increases the minimum mass of main sequence hydrogen burning, partly determining whether or not the object is a star at all. Similar dark matter candidates reduce the luminosities of low-mass stars dramatically and greatly accelerate the cooling of brown dwarfs. Such light dark matter is of interest given results from the DAMA, CoGeNT, and CRESST dark matter searches. I conclude with possible strategies for observing these phenomena and exploiting them to constrain dark matter models.
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