The non-spherical ground state of Proca stars
arXiv:2311.14800 · doi:10.1016/j.physletb.2024.138595
Abstract
Spherical Proca Stars (PSs) are regarded as the ground state amongst the family of PSs. In accordance, spherical PSs are thought to have a fundamental branch of stable solutions. In this Letter, we provide energetic, morphological and dynamical evidence that spherical PSs are actually excited states. The ground state is shown to be a family of static, non-spherical, in fact prolate, PSs. The spherical stars in the fundamental branch, albeit stable against spherical perturbations, turn out to succumb to non-spherical dynamics, undergoing an isometry breaking into prolate PSs. We also provide evidence for the dynamical formation of prolate PSs, starting from spherical dilute initial data, via gravitational cooling. Consequently, PSs provide a remarkable example of (possibly compact) relativistic stars, in General Relativity minimally coupled to a simple, physical, field theory model, where staticity plus stability implies non-sphericity.
6 pages, 4 figures; ; movies of the numerical simulations reported can be found in http://gravitation.web.ua.pt/index.php/node/4657
References in corpus (7)
- Ultralight scalars as cosmological dark matter
- Asymptotically flat scalar, Dirac and Proca stars: discrete vs. continuous families of solutions
- Kerr black holes with synchronised hair: an analytic model and dynamical formation
- Dark Photon Stars: Formation and Role as Dark Matter Substructure
- Multipolar boson stars: macroscopic Bose-Einstein condensates akin to hydrogen orbitals
- Impact of the wave-like nature of Proca stars on their gravitational-wave emission
- Stability and physical properties of spherical excited scalar boson stars
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- Bifurcations in Bosonic Stars: chains and rings from spherical solutions
- Nonrelativistic Proca stars: Spherical stationary and multi-frequency states
- Linear stability of nonrelativistic Proca stars
- Constraint-satisfying binary boson star initial data via XCFC
- Intrinsic pressure anisotropy in spherical Proca stars