Selfinteractions can (also) destabilize bosonic stars
Abstract
We study the dynamical stability of ProcaHiggs stars, in spherical symmetry. These are solutions of the EinsteinProcaHiggs model, which features a Higgslike field coupled to a Proca field, both of which minimally coupled to the gravitational field. The corresponding stars can be regarded as Proca stars with selfinteractions, while avoiding the hyperbolicity issues of selfinteracting EinsteinProca models. We report that these configurations are stable near the Proca limit in the candidate stable branches, but exhibit instabilities in certain parts of the parameter space, even in the candidate stable branches, regaining their stability for very strong selfinteractions. This shows that for these models, unlike various examples of scalar boson stars, selfinteractions can deteriorate, rather than improve, the dynamical robustness of bosonic stars.
 Publication:

arXiv eprints
 Pub Date:
 April 2024
 DOI:
 10.48550/arXiv.2404.08740
 arXiv:
 arXiv:2404.08740
 Bibcode:
 2024arXiv240408740B
 Keywords:

 General Relativity and Quantum Cosmology;
 High Energy Physics  Theory
 EPrint:
 14 pages, 11 figures