Testing black hole superradiance with pulsar companions
We show that the magnetic dipole and gravitational radiation emitted by a pulsar can undergo superradiant scattering off a spinning black hole companion. We find that the relative amount of superradiant modes in the radiation depends on the pulsar's angular position relative to the black hole...
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2015-10-01
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Series: | Physics Letters B |
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doaj-cdddd64ed50147f4a35ecf76f136e9562020-11-24T22:35:43ZengElsevierPhysics Letters B0370-26931873-24452015-10-01749C22623010.1016/j.physletb.2015.07.063Testing black hole superradiance with pulsar companionsJoão G. RosaWe show that the magnetic dipole and gravitational radiation emitted by a pulsar can undergo superradiant scattering off a spinning black hole companion. We find that the relative amount of superradiant modes in the radiation depends on the pulsar's angular position relative to the black hole's equatorial plane. In particular, when the pulsar and black hole spins are aligned, superradiant modes are dominant at large angles, leading to an amplification of the pulsar's luminosity, whereas for small angles the radiation is dominantly composed of non-superradiant modes and the signal is attenuated. This results in a characteristic orbital modulation of the pulsar's luminosity, up to the percent level within our approximations, which may potentially yield a signature of superradiant scattering in astrophysical black holes and hence an important test of general relativity.http://www.sciencedirect.com/science/article/pii/S0370269315005730 |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
João G. Rosa |
spellingShingle |
João G. Rosa Testing black hole superradiance with pulsar companions Physics Letters B |
author_facet |
João G. Rosa |
author_sort |
João G. Rosa |
title |
Testing black hole superradiance with pulsar companions |
title_short |
Testing black hole superradiance with pulsar companions |
title_full |
Testing black hole superradiance with pulsar companions |
title_fullStr |
Testing black hole superradiance with pulsar companions |
title_full_unstemmed |
Testing black hole superradiance with pulsar companions |
title_sort |
testing black hole superradiance with pulsar companions |
publisher |
Elsevier |
series |
Physics Letters B |
issn |
0370-2693 1873-2445 |
publishDate |
2015-10-01 |
description |
We show that the magnetic dipole and gravitational radiation emitted by a pulsar can undergo superradiant scattering off a spinning black hole companion. We find that the relative amount of superradiant modes in the radiation depends on the pulsar's angular position relative to the black hole's equatorial plane. In particular, when the pulsar and black hole spins are aligned, superradiant modes are dominant at large angles, leading to an amplification of the pulsar's luminosity, whereas for small angles the radiation is dominantly composed of non-superradiant modes and the signal is attenuated. This results in a characteristic orbital modulation of the pulsar's luminosity, up to the percent level within our approximations, which may potentially yield a signature of superradiant scattering in astrophysical black holes and hence an important test of general relativity. |
url |
http://www.sciencedirect.com/science/article/pii/S0370269315005730 |
work_keys_str_mv |
AT joaogrosa testingblackholesuperradiancewithpulsarcompanions |
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