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

Understand

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.