Black holes and solitons in generalized scalar-tensor gravity models
| Full text | |
| Author(s): |
Total Authors: 2
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| Affiliation: | [1] Univ Mons, Phys Theor & Math, Pl Parc, B-7000 Mons - Belgium
[2] Univ Sao Paulo, IFSC, BR-13560970 Sao Carlos, SP - Brazil
Total Affiliations: 2
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| Document type: | Journal article |
| Source: | Physics Letters B; v. 772, p. 476-482, SEP 10 2017. |
| Web of Science Citations: | 1 |
| Abstract | |
We study 4-dimensional charged and static black holes in a generalized scalar-tensor gravity model, in which a shift symmetry for the scalar field exists. For vanishing scalar field the solution corresponds to the Reissner-Nordstrom (RN) solution, while solutions of the full scalar-gravity model have to be constructed numerically. We demonstrate that these black holes support Galilean scalar hair up to a maximal value of the scalar-tensor coupling that depends on the value of the charge and can be up to roughly twice as large as that for uncharged solutions. The Hawking temperature T-H of the hairy black holes at maximal scalar-tensor coupling decreases continuously with the increase of the charge and reaches T-H = 0 for the highest possible charge that these solutions can carry. However, in this limit, the scalar-tensor coupling needs to vanish. The limiting solution hence corresponds to the extremal RN solution, which does not support regular Galileanscalar hair due to its AdS(2) x S-2 near-horizon geometry. (C) 2017 The Author(s). Published by Elsevier B.V. (AU) | |
| FAPESP's process: | 16/12605-2 - (in)stability and excitation of modes in (asymptotically) anti-de Sitter space-times with view to the AdS/CFT correspondence |
| Grantee: | Betti Hartmann |
| Support type: | Regular Research Grants |