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Title: Dynamical l-boson stars: Generic stability and evidence for nonspherical solutions
Author: Jaramillo, V.
Sanchis-Gual, N.
Barranco, J.
Bernal, A.
Degollado, J. C.
Herdeiro, C. A. R.
Nunez, D.
Issue Date: 15-Jun-2020
Publisher: American Physical Society
Abstract: l-boson stars are static, spherical, multifield self-gravitating solitons. They are asymptotically flat, finite energy solutions of Einstein's gravity minimally coupled to an odd number of massive, complex scalar fields. A previous study assessed the stability of l-boson stars under spherical perturbations, finding that there are both stable and unstable branches of solutions, as for single-field boson stars (l = 0). In this work we probe the stability of l-boson stars against nonspherical perturbations by performing numerical evolutions of the Einstein-Klein-Gordon system, with a 3D code. For the timescales explored, the l-boson stars belonging to the spherical stable branch do not exhibit measurable growing modes. We find, however, evidence of zero modes; that is, nonspherical perturbations that neither grow nor decay. This suggests the branching off toward a larger family of equilibrium solutions: we conjecture that l-boson stars are the enhanced isometry point of a larger family of static (and possibly stationary), nonspherical multifield self-gravitating solitons.
Peer review: yes
DOI: 10.1103/PhysRevD.101.124020
ISSN: 2470-0010
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