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White Dwarfs (WD) capture Dark Matter (DM) as they orbit within their hosthalos. These captured particles may subsequently annihilate, heating thestellar core and preventing the WD from cooling. The potential wells of WDs areconsiderably deeper and core temperatures significantly cooler than those ofmain sequence stars. Consequently, DM evaporation is less important in WDs andDM with masses $M_{\chi} \gtrsim 100\, \kev$ and annihilation cross-sectionsorders of magnitude below the canonical thermal cross-section ($\sigmav \gtrsim10^{-46}\, \cm^3$/s) can significantly alter WD cooling in particularastrophysical environments. We consider WDs in globular clusters (GCs) anddwarf galaxies. If the parameters of the DM particle are known, then thetemperature of the coolest WD in a GC can be used to constrain the DM densityof the cluster's halo (potentially even ruling out the presence of a halo ifthe inferred density is of order the ambient Galactic density). Recentlyseveral direct detection experiments have seen signals whose origins might bedue to low mass DM. In this paper, we show that if these claims from CRESST,DAMA, CDMS-Si, and CoGeNT could be interpreted as DM, then observations of NGC6397 limit the fraction of DM in that cluster to be $f_{\mathrm{DM}} \lesssim10^{-3}$. This would be an improvement over existing constraints of 3 orders ofmagnitude and clearly rule out a significant DM halo for this cluster...

Indirect Probes of Dark Matter and Globular Cluster Properties From Dark Matter Annihilation within the Coolest White Dwarfs