Dark-matter admixed white dwarfs
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AbstractWe study the equilibrium structures of white dwarfs with dark matter cores formed by non-self-annihilating dark matter (DM) particles with masses ranging from 1 GeV to 100 GeV, which are assumed to form an ideal degenerate Fermi gas inside the stars. For DM particles of mass 10 GeV and 100 GeV, we find that stable stellar models exist only if the mass of the DM core inside the star is less than O(10(-3))M-circle dot and O(10(-6))M-circle dot, respectively. The global properties of these stars, and in particular the corresponding Chandrasekhar mass limits, are essentially the same as those of traditional white dwarf models without DM. Nevertheless, in the 10 GeV case, the gravitational attraction of the DM core is strong enough to squeeze the normal matter in the core region to densities above neutron drip, far above those in traditional white dwarfs. For DM with a particle mass of 1 GeV, the DM core inside the star can be as massive as similar to 0.1M(circle dot) and affects the global structure of the star significantly. In this case, the radius of a stellar model with DM can be about two times smaller than that of a traditional white dwarf. Furthermore, the Chandrasekhar mass limit can also be decreased by as much as 40%. Our results may have implications on the extent to which type Ia supernovae can be regarded as standard candles-a key assumption in the discovery of dark energy.
All Author(s) ListLeung SC, Chu MC, Lin LM, Wong KW
Journal namePhysical Review D - Particles, Fields, Gravitation and Cosmology
Year2013
Month6
Day7
Volume Number87
Issue Number12
PublisherAmerican Physical Society
ISSN1550-7998
eISSN1550-2368
LanguagesEnglish-United Kingdom
Web of Science Subject CategoriesAstronomy & Astrophysics; ASTRONOMY & ASTROPHYSICS; Physics; Physics, Particles & Fields; PHYSICS, PARTICLES & FIELDS

Last updated on 2020-02-08 at 01:12