Indirect probes of dark matter and globular cluster properties from dark matter annihilation within the coolest white dwarfs

Travis J. Hurst, Andrew R. Zentner, Aravind Natarajan, and Carles Badenes
Phys. Rev. D 91, 103514 – Published 18 May 2015

Abstract

White dwarfs (WD) capture dark matter (DM) as they orbit within their host halos. These captured particles may subsequently annihilate, heating the stellar core and preventing the WD from cooling. The potential wells of WDs are considerably deeper and core temperatures significantly cooler than those of main sequence stars. Consequently, DM evaporation is less important in WDs and DM with masses Mχ100keV, and annihilation cross sections orders of magnitude below the canonical thermal cross section (σav1046cm3/s) can significantly alter WD cooling in particular astrophysical environments. We consider WDs in globular clusters (GCs) and dwarf galaxies. If the parameters of the DM particle are known, then the temperature of the coolest WD in a GC can be used to constrain the DM density of the cluster’s halo (potentially even ruling out the presence of a halo if the inferred density is of order the ambient Galactic density). Recently, several direct detection experiments have seen signals whose origins might be due 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 NGC 6397 limit the fraction of DM in that cluster to be fDM103. This would be an improvement over existing constraints of 3 orders of magnitude and would clearly rule out a significant DM halo for this cluster. More generally, we show how such observations constrain combinations of DM and GC properties. Building on previous work, we also show how observations of WDs in dwarf galaxies, such as Segue I, can provide novel constraints on low-mass DM or DM with very low contemporary annihilation cross sections as may be realized in models in which s-wave annihilation is suppressed and p-wave annihilation dominates. This paper provides further motivation for high-quality observations of stellar populations as a probe of dark matter.

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  • Received 21 October 2014

DOI:https://doi.org/10.1103/PhysRevD.91.103514

© 2015 American Physical Society

Authors & Affiliations

Travis J. Hurst, Andrew R. Zentner, Aravind Natarajan, and Carles Badenes*

  • Department of Physics and Astronomy and The Pittsburgh Particle Physics, Astrophysics, and Cosmology Center (Pitt-PACC), University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA

  • *TJH47@PITT.edu

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Vol. 91, Iss. 10 — 15 May 2015

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