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General Relativity and Quantum Cosmology, gr-qc,Astrophysics, Cosmology and Extragalactic Astrophysics, astro-ph.CO
Abstract:
Compact objects, like neutron stars and white dwarfs, may accrete dark
matter, and then be sensitive probes of its presence. These compact stars with
a dark matter component can be modeled by a perfect fluid minimally coupled to
a complex scalar field (representing a bosonic dark matter component),
resulting in objects known as fermion-boson stars. We have performed the
dynamical evolution of these stars in order to analyze their stability, and to
study their spectrum of normal modes, which may reveal the amount of dark
matter in the system. Their stability analysis shows a structure similar to
that of an isolated (fermion or boson) star, with equilibrium configurations
either laying on the stable or on the unstable branch. The analysis of the
spectrum of normal modes indicates the presence of new oscillation modes in the
fermionic part of the star, which result from the coupling to the bosonic
component through the gravity.
