BS2 - Scalar fields in cosmology |
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Speaker |
Sanchis-Gual, Nicolas |
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Coauthors |
Degollado, Juan Carlos; Montero, Pedro J.; Font, Jose A. |
| Talk Title |
Quasistationary Solutions of Self-Gravitating Scalar Fields Around Black Holes |
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Abstract |
Recent perturbative studies have shown the existence of long-lived, quasi-stationary configurations of scalar fields around black holes. In particular, such configurations have been found to survive for cosmological timescales, which is a requirement for viable dark matter halo models in galaxies based on such type of structures. We have performed a series of numerical relativity simulations of dynamical non-rotating black holes surrounded by self-gravitating scalar fields. We have solved numerically the coupled system of equations formed by the Einstein and the Klein-Gordon equations under the assumption of spherical symmetry using spherical coordinates. Our results confirm the existence of oscillating, long-lived, self-gravitating scalar field configurations around non-rotating black holes in highly dynamical spacetimes with a rich scalar field environment. Our numerical simulations are long-term stable and allow for the extraction of the resonant frequencies to make a direct comparison with results obtained in the linearized regime. |
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