Equatorial extreme-mass-ratio inspirals in Kerr black holes with scalar hair spacetimes

被引：14

作者：

Collodel, Lucas G. ^{[1
]}

Doneva, Daniela D. ^{[1
,2
]}

Yazadjiev, Stoytcho S. ^{[1
,3
,4
]}

机构：

[1] Eberhard Karls Univ Tubingen, Theoret Astrophys, D-72076 Tubingen, Germany

[2] Bulgarian Acad Sci, INRNE, Sofia 1784, Bulgaria

[3] Sofia Univ, Fac Phys, Dept Theoret Phys, Sofia 1164, Bulgaria

[4] Bulgarian Acad Sci, Inst Math & Informat, Acad G Bonchev St 8, Sofia 1113, Bulgaria

来源：

PHYSICAL REVIEW D | 2022年 / 105卷 / 04期

关键词：

D O I：

10.1103/PhysRevD.105.044036

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

In this work, we analyze some judiciously chosen solutions of Kerr black holes with scalar hair (KBHsSH) of special interest for gravitational wave events originated from extreme mass ratio inspirals (EMRIs). Because of the off-center distribution of energy density, these spacetimes are warped in such a way that not all metric functions behave monotonically on the equatorial plane as in the exterior region of Kerr black holes (KBHs). This has great impact on the orbital parameters, which in turn affect the imprints on signals descendant from EMRIs in an adiabatic evolution. By investigating circular obit parameters, we unveil what qualitative features could be present in the signals that are new and distinct compared to KBHs, and we evolve some inspirals by employing the usual quadrupole formula approximation. We show that the frequencies of the emitted signals behave nonmonotonically, i.e., they can backward chirp, and for some particular cases they can become arbitrarily small, falling below LISA's sensibility range. Finally, we present two sets of waveforms produced by a noncircular EMRI in which the compact object follows a type of geodesic motion typically present in spacetimes with a static ring, in which the compact object is periodically momentarily at rest.

引用

页数：13

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