Please use this identifier to cite or link to this item:
http://hdl.handle.net/10773/39984
Title: | EMRIs around j = 1 black holes with synchronised hair |
Author: | Delgado, Jorge F. M. Herdeiro, Carlos A. R. Radu, Eugen |
Keywords: | GR black holes Gravitational waves/theory Gravitational waves in GR and beyond: theory, gravity |
Issue Date: | 2023 |
Publisher: | IOP Publishing |
Abstract: | We study extreme mass ratio inspirals (EMRIs) due to an infalling Light Compact Object (LCO) onto a generic class of stationary and axi-symmetric massive compact objects (MCO — with or without a horizon). Using the quadrupole hybrid formalism we obtain a master formula for the evolution of the radius of the LCO and find qualitatively different behaviours depending on the geodesic structure of the MCO. We then specialize the MCO to a black hole with synchronised scalar hair (BHsSH). To allow a comparison with a highly spinning Kerr BH, we consider BHsSH with dimensionless spin, j = 1. This yields two distinct sequences of solutions. The first harbours Kerr-like solutions with maximal hairiness of ∼ 10%. The corresponding EMRIs are Kerr-like, but the cut-off frequency can be a few times smaller than in Kerr, yielding waveforms with quantitatively significant non-Kerrness. The second sequence links the extremal Kerr black hole to a mini-boson star with j = 1. Here we observe qualitative non-Kerrness, such as the non-monotonically increase of the angular velocity and stagnation endpoints, reflecting Kerr-unlike geodesic structures. |
Peer review: | yes |
URI: | http://hdl.handle.net/10773/39984 |
DOI: | 10.1088/1475-7516/2023/10/029 |
Appears in Collections: | CIDMA - Artigos GGDG - Artigos |
Files in This Item:
File | Description | Size | Format | |
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JCAP10(2023)029.pdf | 1.82 MB | Adobe PDF |
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