Numerical simulations of single and binary black holes in scalar-tensor theories: Circumventing the no-hair theorem
| Autor: | Leonardo Gualtieri, Michael Horbatsch, Ulrich Sperhake, Vitor Cardoso, Emanuele Berti |
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| Jazyk: | angličtina |
| Rok vydání: | 2013 |
| Předmět: |
High Energy Physics - Theory
Nuclear and High Energy Physics Astrophysics::High Energy Astrophysical Phenomena FOS: Physical sciences General Relativity and Quantum Cosmology (gr-qc) 01 natural sciences General Relativity and Quantum Cosmology Micro black hole High Energy Physics - Phenomenology (hep-ph) Binary black hole 0103 physical sciences Black brane 010306 general physics Physics High Energy Astrophysical Phenomena (astro-ph.HE) 010308 nuclear & particles physics Black hole Numerical relativity High Energy Physics - Phenomenology Classical mechanics High Energy Physics - Theory (hep-th) No-hair theorem Astrophysics - High Energy Astrophysical Phenomena Scalar field Hawking radiation |
| Popis: | Scalar-tensor theories are a compelling alternative to general relativity and one of the most accepted extensions of Einstein's theory. Black holes in these theories have no hair, but could grow "wigs" supported by time-dependent boundary conditions or spatial gradients. Time-dependent or spatially varying fields lead in general to nontrivial black hole dynamics, with potentially interesting experimental consequences. We carry out a numerical investigation of the dynamics of single and binary black holes in the presence of scalar fields. In particular we study gravitational and scalar radiation from black-hole binaries in a constant scalar-field gradient, and we compare our numerical findings to analytical models. In the single black hole case we find that, after a short transient, the scalar field relaxes to static configurations, in agreement with perturbative calculations. Furthermore we predict analytically (and verify numerically) that accelerated black holes in a scalar-field gradient emit scalar radiation. For a quasicircular black-hole binary, our analytical and numerical calculations show that the dominant component of the scalar radiation is emitted at twice the binary's orbital frequency. Comment: 21 pages, 6 figures, matches version accepted in Physical Review D |
| Databáze: | OpenAIRE |
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