Fermion-boson stars with a quartic self-interaction in the boson sector

Abstract

Fermion-boson stars are solutions of the gravitationally coupled Einstein-Klein-Gordon-Hydrodynamic equations system. By means of methods developed in previous works, we perform a stability analysis of fermion-boson stars that include a quartic self-interaction in their bosonic part. Additionally, we describe the complete structure of the stability and instability regions of the space of free parameters, which we argue is qualitatively the same for any value of the quartic self-interaction. The relationship between the total mass of mixed stars and their general stability is also discussed in terms of the structure identified within the stability region.

arXiv comment12 pages, 16 figures

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• Neutron Star with Dark Matter Admixture: A Candidate for Bridging the Mass Gap
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• Ultralight bosonic dark matter in white dwarfs and potential observational consequences
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