Please use this identifier to cite or link to this item:
http://hdl.handle.net/10773/17965
Title: | Superradiance in the sky |
Author: | Rosa, João G. |
Keywords: | Black hole superradiance Gravitational waves Electromagnetic waves Pulsars Compact binaries |
Issue Date: | Mar-2017 |
Publisher: | American Physical Society |
Abstract: | We discuss the conditions under which plane electromagnetic and gravitational waves can be amplified by a rotating black hole due to superradiant scattering. We show, in particular, that amplification can occur for low-frequency waves with an incidence angle parametrically close to 0 (or π) with respect to the black hole spin axis and with a parametrically small left (or right) polarization. This is the case of the radiation emitted by a spinning electric/magnetic dipole or gravitational quadrupole orbiting a black hole companion at large radius and co-rotating with the latter. This can yield observable effects of superradiance, for example, in neutron star-stellar mass black hole binaries, as well as in triple systems composed by a compact binary orbiting a central supermassive black hole. Due to superradiance, the total source luminosity in these systems exhibits a characteristic orbital modulation that may lead to significant observational signatures, thus paving the way for testing, in the near future, one of the most peculiar predictions of general relativity. |
Peer review: | yes |
URI: | http://hdl.handle.net/10773/17965 |
DOI: | 10.1103/PhysRevD.95.064017 |
ISSN: | 2470-0010 |
Appears in Collections: | CIDMA - Artigos GGDG - Artigos |
Files in This Item:
File | Description | Size | Format | |
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1612.01826.pdf | Main article | 1.3 MB | Adobe PDF | View/Open |
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