Boosted black string bombs
Sep, 201214 pages
Published in:
- JHEP 02 (2013) 014
e-Print:
- 1209.4211 [hep-th]
Report number:
- EDINBURGH-2012-18
View in:
Citations per year
Abstract: (Springer)
We study the formation of superradiant bound states for massive scalar fields in five-dimensional rotating black string geometries with a non-vanishing Kaluza-Klein momentum along the compact direction. Even though all Kaluza-Klein modes may form bound states in this geometry, in realistic extra-dimensional models and astrophysical black holes only the zero-mode is sufficiently light for superradiant instabilities to develop, provided the field has a small but non-vanishing mass, as for example for axion-like particles. We use analytical and numerical methods to show that, although the Kaluza-Klein momentum decreases the upper bound on the field mass for an instability to develop, it may enhance its maximum growth rate by more than 50%, thus boosting the black hole bomb mechanism. We discuss the possible observational consequences of this result and its potential as an astrophysical probe of non-trivial extra-dimensional compactifications.Note:
- 15 pages, 6 figures; revised version published in JHEP
- Kaluza-Klein
- black hole
- black string: rotation
- bound state
- compactification
- dimension: 5
- superradiance
- zero mode
References(64)
Figures(6)
- [1]
- [2]
- [3]
- [4]
- [5]
- [6]
- [7]
- [8]
- [9]
- [10]
- [11]
- [12]
- [13]
- [14]
- [15]
- [16]
- [17]
- [18]
- [18]
- [19]
- [20]
- [21]
- [22]
- [23]
- [23]