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A compact object with a mass $\mathcal{O}(1 \sim 1000) M_{\odot}$, such as a black hole of stellar or primordial origin or a neutron star, and a much lighter exotic compact object with a subsolar mass could form a non-standard mini extreme…

Instrumentation and Methods for Astrophysics · Physics 2022-05-24 Huai-Ke Guo , Andrew Miller

Captures of stellar-mass compact objects (COs) by massive ($\sim 10^6 M_\odot$) black holes (MBHs) are potentially an important source for LISA, the proposed space-based gravitational-wave (GW) detector. The orbits of the inspiraling COs…

General Relativity and Quantum Cosmology · Physics 2009-11-10 Leor Barack , Curt Cutler

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

The low-energy effective action of String Theory introduces corrections to the dilaton-graviton sector, resulting in deformed black holes beyond general relativity. We analyze extreme mass-ratio inspiral systems (EMRIs), where a…

General Relativity and Quantum Cosmology · Physics 2024-08-29 Chao Zhang , Guoyang Fu , Yungui Gong

The measurement of multipole moments of astrophysical objects through gravitational wave (GW) observations provides a novel way to distinguish black holes from other astrophysical objects. This paper studies the gravitational wave radiation…

General Relativity and Quantum Cosmology · Physics 2023-01-10 Mostafizur Rahman , Arpan Bhattacharyya

Stellar-mass black-hole binaries are the most numerous gravitational-wave sources observed to date. Their properties make them suitable for observation both by ground- and space-based detectors. Starting from synthetic catalogues…

High Energy Astrophysical Phenomena · Physics 2025-05-29 R. Buscicchio , J. Torrado , C. Caprini , G. Nardini , N. Karnesis , M. Pieroni , A. Sesana

Space-based gravitational-wave observatories will detect the early inspiral of stellar-mass binary black holes and can track their eccentricity evolution. However, untargeted searches in the space band are computationally demanding and…

High Energy Astrophysical Phenomena · Physics 2026-05-01 Han Wang , Michael J. Williams , Ian Harry , Yi-Ming Hu

We analyze a rotating regular black hole spacetime with an asymptotically Minkowski core, focusing on extreme mass-ratio inspiral (EMRIs) where a stellar-mass object inspirals a supermassive black hole under consideration. Such spacetimes…

General Relativity and Quantum Cosmology · Physics 2025-10-01 Shailesh Kumar , Tieguang Zi

We estimate the accuracy in the measurement of the tidal Love number of a supermassive compact object through the detection of an extreme mass ratio inspiral~(EMRI) by the future LISA mission. A nonzero Love number would be a smoking gun…

General Relativity and Quantum Cosmology · Physics 2023-02-01 Gabriel Andres Piovano , Andrea Maselli , Paolo Pani

I review the status of research, conducted by a variety of independent groups, aimed at the eventual observation of Extreme Mass Ratio Inspirals (EMRIs) with gravitational wave detectors. EMRIs are binary systems in which one of the objects…

General Relativity and Quantum Cosmology · Physics 2014-11-17 Steve Drasco

The field of gravitational waves is rapidly progressing due to the noticeable advancements in the sensitivity of gravitational-wave detectors that has enabled the detection prospects of binary black hole mergers. Extreme mass ratio inspiral…

General Relativity and Quantum Cosmology · Physics 2026-03-05 Mostafizur Rahman , Shailesh Kumar , Arpan Bhattacharyya

One of the primary objectives for space-borne gravitational wave detectors is the detection of extreme-mass-ratio inspirals (EMRIs). This undertaking poses a substantial challenge because of the complex and long EMRI signals, further…

General Relativity and Quantum Cosmology · Physics 2023-09-14 Qianyun Yun , Wen-Biao Han , Yi-Yang Guo , He Wang , Minghui Du

The upcoming gravitational wave (GW) observatory LISA will measure the parameters of sources like extreme-mass-ratio inspirals (EMRIs) to exquisite precision. These measurements will also be sensitive to perturbations to the vacuum,…

General Relativity and Quantum Cosmology · Physics 2025-06-18 Shubham Kejriwal , Francisco Duque , Alvin J. K. Chua , Jonathan Gair

Eccentricity has emerged as a potentially useful tool for helping to identify the origin of black hole mergers. However, owing to the large number of harmonics required to compute the amplitude of an eccentric signal, eccentric templates…

High Energy Astrophysical Phenomena · Physics 2022-01-26 Lisa Randall , Alexandra Shelest , Zhong-Zhi Xianyu

Extreme mass ratio inspirals (EMRIs) are compact binary systems characterized by a mass-ratio $q=m/M$ in the range $~10^{-9}-10^{-4}$ and represent primary gravitational wave (GW) sources for the forthcoming Laser Interferometer Space…

We present a complete pipeline for detecting and characterizing gravitational waves (GWs) produced by the inspiral of stellar-mass binary black holes in data from the Laser Interferometer Space Antenna (LISA). The analysis framework relies…

General Relativity and Quantum Cosmology · Physics 2026-05-25 Diganta Bandopadhyay , Christian E. A. Chapman-Bird , Alberto Vecchio

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

Extreme mass ratio inspirals (EMRIs) are excellent sources for space-based observatories to explore the properties of black holes and test no-hair theorems. We consider EMRIs with a charged compact object inspiralling onto a Kerr black hole…

General Relativity and Quantum Cosmology · Physics 2023-06-29 Chao Zhang , Hong Guo , Yungui Gong , Bin Wang

Gravitational waves from inspiraling sub-solar mass compact objects would provide almost definitive evidence for the existence of primordial black holes. In this chapter, we explain why these exotic objects are interesting candidates for…

General Relativity and Quantum Cosmology · Physics 2025-05-05 Andrew L. Miller

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
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