Gravitational effects of condensate dark matter on compact stellar objects

Abstract

We study the gravitational effect of non-self-annihilating dark matter on compact stellar objects.The self-interaction of condensate dark matter can give high accretion rate of dark matter onto stars. Phase transition to condensation state takes place when the dark matter density exceeds the critical value. A compact degenerate dark matter core is developed and alter the structure and stability of the stellar objects. Condensate dark matter admixed neutron stars is studied through the two-fluid TOV equation. The existence of condensate dark matter deforms the mass-radius relation of neutron stars and lower their maximum baryonic masses and radii. The possible effects on the Gamma-ray Burst rate in high redshift are discussed.

Dark stars in Starobinsky’s model

“…The properties of compact stars made of ordinary matter admixed with condensed dark matter have been studied in [22][23][24][25], and similarly admixed with fermionic matter in [26][27][28][29].…”

Gravitational effects of condensed dark matter on strange stars

“…Even if dark matter does not interact directly with normal matter, it can have significant gravitational effects on stellar objects [16][17][18]. In [18] the authors studied the gravitational effects of fermionic dark matter on strange stars.…”

“…where is the reduced Planck constant, and l is the scattering length and determines the self interaction cross section of dark matter, σ χ = 4πl 2 [17,24].…”

Dilatonic equation of hydrostatic equilibrium and neutron star structure

“…Also, the physical characteristics of stars using TOV equation have been investigated in Refs. (Silbar 2004;Narain 2006;Bordbar 2006a;Bordbar 2006b;Li 2012;Yazdizadeh 2013;Oliveira 2014). On the other hand, if one is interested in studying the structure and evolution of stars in different gravities, one should obtain the HEE in those gravity models.…”