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Intermediate mass ratio inspirals (IMRIs) of binary black holes with mass ratios $10^{-4}\lesssim q \lesssim 0.1$ are astrophysically interesting sources of gravitational waves. Mergers of intermediate-mass black holes (IMBHs) with…

We show that gravitational floating orbits may exist for black holes with rotating hairs. These black hole hairs could originate from the superradiant growth of a light axion field around the rotating black holes. If a test particle rotates…

General Relativity and Quantum Cosmology · Physics 2019-03-27 Jun Zhang , Huan Yang

Sun-like stars can transmute into comparable mass black holes by steadily accumulating heavy non-annihilating dark matter particles over the course of their lives. If such stars form in binary systems, they could give rise to…

High Energy Physics - Phenomenology · Physics 2024-08-07 Sulagna Bhattacharya , Andrew L. Miller , Anupam Ray

The gravitational waves emitted by massive black hole binaries can be affected by a variety of environmental effects, which, if detected, could inform astrophysics and cosmology. We here study how gravitational waves emitted by black holes…

Cosmology and Nongalactic Astrophysics · Physics 2025-11-12 Tomás Ferreira Chase , Diana López Nacir , Nicolás Yunes

General relativity predicts that black holes are described by the Kerr metric, which has integrable geodesics. This property is crucial to produce accurate waveforms from extreme-mass-ratio inspirals. Astrophysical environments,…

General Relativity and Quantum Cosmology · Physics 2023-10-31 Kyriakos Destounis , Federico Angeloni , Massimo Vaglio , Paolo Pani

We investigate the imprints of chaos in gravitational waves from extreme-mass-ratio inspirals configuration, where a stellar massive object, confined in a harmonic potential, orbits a supermassive Schwarzschild-like black hole embedded in a…

General Relativity and Quantum Cosmology · Physics 2025-12-05 Surajit Das , Surojit Dalui , Bum-Hoon Lee , Yi-Fu Cai

Supermassive black holes and their surrounding dense stellar environments nourish a variety of astrophysical phenomena. We focus on the distribution of stellar-mass black holes around the supermassive black hole and the consequent formation…

Astrophysics of Galaxies · Physics 2024-12-11 Barak Rom , Itai Linial , Karamveer Kaur , Re'em Sari

The intermediate-mass-ratio inspirals (IMRIs) may be surrounded by dark matter (DM) minispikes. The dynamical friction from these DM minispike structures can affect the dynamics and the gravitational wave (GW) emission of the IMRIs. We…

High Energy Astrophysical Phenomena · Physics 2025-11-20 Yu-Chen Zhou , Hong-Bo Jin , Cong-Feng Qiao , Yue-Liang Wu

Extreme mass-ratio inspirals detectable by the future Laser Interferometer Space Antenna provide a unique way to test general relativity and fundamental physics. Motivated by this possibility, here we study in detail the EMRI dynamics in…

General Relativity and Quantum Cosmology · Physics 2020-07-22 Gabriel Andres Piovano , Andrea Maselli , Paolo Pani

Extreme mass ratio inspirals, compact objects spiraling into massive black holes, represent key sources for future space-based gravitational-wave detectors such as LISA. The inspirals will occur within rich astrophysical environments…

General Relativity and Quantum Cosmology · Physics 2025-12-22 Lukáš Polcar , Vojtěch Witzany

If binary intermediate-mass black holes (IMBHs; with masses between 100 and $10^4 \Msun$) form in dense stellar clusters, their inspiral will be detectable with the planned Laser Interferometer Space Antenna (LISA) out to several Gpc. Here…

Solar and Stellar Astrophysics · Physics 2014-11-18 Pau Amaro-Seoane , Cole Miller , Marc Freitag

In this paper, we study the secular dynamical evolution of binaries composed of intermediate-mass and stellar-mass black holes (IMBHs and SBHs, respectively) in orbit about a central super-massive black hole (SMBH) in galactic nuclei. Such…

Astrophysics of Galaxies · Physics 2018-08-29 Giacomo Fragione , Nathan Leigh

Extreme Mass Ratio Inspirals (EMRIs) are among the key targe sources for the space-based gravitational wave (GW) detectors. The waveforms of the EMRIs are highly sensitive to the types of the central supermassive black hole (SBH) and can…

General Relativity and Quantum Cosmology · Physics 2026-04-28 Kun Meng , Shao-Jun Zhang , Nan Yang

We present {bhpwave}: a new Python-based, open-source tool for generating the gravitational waveforms of stellar-mass compact objects undergoing quasi-circular inspirals into rotating massive black holes. These binaries, known as…

General Relativity and Quantum Cosmology · Physics 2024-03-08 Zachary Nasipak

Quantum black holes (BHs), thought of as an excited multilevel system, can be effectively modelled by replacing an event horizon with a partially reflective membrane. This emergent feature affects their interaction with hosting…

General Relativity and Quantum Cosmology · Physics 2024-11-05 Soumodeep Mitra , Sumanta Chakraborty , Rodrigo Vicente , Justin C. Feng

Extreme-mass-ratio inspirals (EMRIs) are important targets for future space-borne gravitational-wave (GW) detectors, such as the Laser Interferometer Sapce Antenna (LISA). Recent works suggest that EMRI may reside in a population of newly…

High Energy Astrophysical Phenomena · Physics 2022-05-18 Xian Chen , Yu Qiu , Shuo Li , F. K. Liu

We estimated the sensitivity of the upcoming advanced, ground-based gravitational-wave observatories (the upgraded LIGO and Virgo and the KAGRA interferometers) to coalescing intermediate mass black hole binaries (IMBHB). We added waveforms…

General Relativity and Quantum Cosmology · Physics 2014-09-17 G. Mazzolo , F. Salemi , M. Drago , V. Necula , C. Pankow , G. A. Prodi , V. Re , V. Tiwari , G. Vedovato , I. Yakushin , S. Klimenko

Studies regarding extra-dimensions have been of great interest in modern theoretical physics, including their observational consequences from future gravitational wave (GW) observatories. In this direction, extreme-mass-ratio inspirals…

General Relativity and Quantum Cosmology · Physics 2025-07-17 Shailesh Kumar , Tieguang Zi , Arpan Bhattacharyya

Gravitational atoms produced from the superradiant extraction of rotational energy of spinning black holes can reach energy densities significantly higher than that of dark matter, turning black holes into powerful potential detectors for…

General Relativity and Quantum Cosmology · Physics 2023-03-15 Yifan Chen , Xiao Xue , Richard Brito , Vitor Cardoso

The future space-based gravitational wave observatory, the Laser Interferometer Space Antenna, is expected to observe between 1-1000s extreme mass-ratio inspirals (EMRIs) per year. Due to the simultaneous presence of other gravitational…

General Relativity and Quantum Cosmology · Physics 2025-12-30 Sviatoslav Khukhlaev , Stanislav Babak