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Inspirals of stellar-mass compact objects into massive black holes, known as extreme mass ratio inspirals (EMRIs), are one of the key targets for upcoming space-based gravitational-wave detectors. In this paper we take the first steps…

General Relativity and Quantum Cosmology · Physics 2023-08-01 Lukáš Polcar , Georgios Lukes-Gerakopoulos , Vojtěch Witzany

An extreme mass ratio inspiral takes place when a compact stellar object is inspiraling into a supermassive black hole due to gravitational radiation reaction. Gravitational waves (GWs) from this system can be calculated using the Teukolsky…

General Relativity and Quantum Cosmology · Physics 2021-01-14 Viktor Skoupý , Georgios Lukes-Gerakopoulos

In this review article I attempt to summarise past and present-ongoing-work on the problem of the inspiral of a small body in the gravitational field of a much more massive Kerr black hole. Such extreme mass ratio systems, expected to occur…

General Relativity and Quantum Cosmology · Physics 2014-11-17 Kostas Glampedakis

Inspirals of stellar mass compact objects into supermassive black holes are known as extreme mass ratio inspirals. In the simplest approximation, the motion of the compact object is modeled as a geodesic in the space-time of the massive…

General Relativity and Quantum Cosmology · Physics 2020-01-22 Ondřej Zelenka , Georgios Lukes-Gerakopoulos , Vojtěch Witzany , Ondřej Kopáček

Extreme-mass-ratio inspirals, in which a stellar-mass compact object spirals into a supermassive black hole in a galactic core, are expected to be key sources for LISA. Modelling these systems with sufficient accuracy for LISA science…

General Relativity and Quantum Cosmology · Physics 2021-03-31 Jeremy Miller , Adam Pound

The forthcoming space-based gravitational-wave observatory Laser Interferometer Space Antenna (LISA) should enable the detection of Extreme Mass Ratio Inspirals (EMRIs), in which a stellar-mass compact object gradually inspirals into a…

General Relativity and Quantum Cosmology · Physics 2026-02-23 Michal Stratený , Georgios Lukes-Gerakopoulos , Ondřej Zelenka

An expected source of gravitational waves for future detectors in space are the inspirals of small compact objects into much more massive black holes. These sources have the potential to provide a wealth of information about astronomy and…

General Relativity and Quantum Cosmology · Physics 2015-06-03 Jonathan R Gair , Nicolas Yunes , Carl M Bender

Extreme mass ratio inspirals, in which a stellar-mass object merges with a supermassive black hole, are prime sources for space-based gravitational wave detectors because they will facilitate tests of strong gravity and probe the spacetime…

Astrophysics of Galaxies · Physics 2011-02-22 Nicolas Yunes , M. Coleman Miller , Jonathan Thornburg

The inspirals of compact objects into massive black holes are some of the most exciting of the potential sources of gravitational waves for the planned Laser Interferometer Space Antenna (LISA). Observations of such extreme mass ratio…

General Relativity and Quantum Cosmology · Physics 2016-11-15 Jonathan R Gair

Future gravitational wave observatories open a unique avenue to study the environments surrounding black holes. Intermediate or extreme mass ratio inspirals will spend thousands to millions of cycles in the sensitivity range of detectors,…

General Relativity and Quantum Cosmology · Physics 2025-01-20 Conor Dyson , Thomas F. M. Spieksma , Richard Brito , Maarten van de Meent , Sam Dolan

We study a point scalar charge in circular orbit around a topological star, a regular, horizonless soliton emerging from dimensional compactification of Einstein-Maxwell theory in five dimensions, which could describe qualitative properties…

General Relativity and Quantum Cosmology · Physics 2025-07-14 Marco Melis , Richard Brito , Paolo Pani

Extreme mass-ratio inspirals (EMRIs) are long-duration gravitational-wave sources in which a compact object gradually spirals into a massive black hole. Their formation is governed by the interplay between stochastic angular-momentum…

General Relativity and Quantum Cosmology · Physics 2026-03-11 Chen Feng , Yong Tang

The capture and inspiral of compact stellar masses into massive black holes is an important source of low-frequency gravitational waves (with frequencies of ~1-100mHz), such as those that might be detected by the planned Laser…

Astrophysics · Physics 2010-11-11 Jonathan R Gair , Daniel J Kennefick , Shane L Larson

Space-based gravitational-wave interferometers such as LISA will be sensitive to the inspiral of stellar mass compact objects into black holes with masses in the range of roughly 10^5 solar masses to (a few) 10^7 solar masses. During the…

General Relativity and Quantum Cosmology · Physics 2007-05-23 Scott A. Hughes

The gravitational capture of a stellar-mass compact object (CO) by a supermassive black hole is a unique probe of gravity in the strong field regime. Because of the large mass ratio, we call these sources extreme-mass ratio inspirals…

General Relativity and Quantum Cosmology · Physics 2023-04-19 Pau Amaro-Seoane

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

One of the most exciting prospects for the LISA gravitational wave observatory is the detection of gravitational radiation from the inspiral of a compact object into a supermassive black hole. The large inspiral parameter space and low…

General Relativity and Quantum Cosmology · Physics 2009-11-10 Jonathan R Gair , Leor Barack , Teviet Creighton , Curt Cutler , Shane L Larson , E Sterl Phinney , Michele Vallisneri

We consider extreme mass ratio inspirals during which an electrically charged compact object with mass $m_p$ and the charge to mass ratio $q$ inspirals around a Schwarzschild black hole of mass $M$. Using the Teukolsky and generalized…

General Relativity and Quantum Cosmology · Physics 2022-07-13 Chao Zhang , Yungui Gong

We model the quasicircular inspiral of a compact object into a more massive charged black hole. Extreme and intermediate mass-ratio inspirals are considered through a small mass-ratio approximation. Reissner-Nordstr$\ddot{\text{o}}$m…

General Relativity and Quantum Cosmology · Physics 2018-06-06 Ruomin Zhu , Thomas Osburn

We model the inspiral of a compact stellar-mass object into a massive nonrotating black hole including all dissipative and conservative first-order-in-the-mass-ratio effects on the orbital motion. The techniques we develop allow inspirals…

General Relativity and Quantum Cosmology · Physics 2016-03-22 Thomas Osburn , Niels Warburton , Charles R. Evans
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