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Almost every galaxy has a supermassive black hole (SMBH) residing at its center, the Milky Way included. Recent studies suggest that these unique places are expected to host a high abundance of stellar and compact object binaries. These…

High Energy Astrophysical Phenomena · Physics 2021-08-25 Huiyi Wang , Alexander P. Stephan , Smadar Naoz , Bao-Minh Hoang , Katelyn Breivik

Eccentric binary black holes (BBHs) formed through dynamical interactions can significantly contribute to gravitational wave (GW) detections. In this work, we present a simulated catalog of dynamically-formed, stellar-mass BBHs in the local…

High Energy Astrophysical Phenomena · Physics 2026-05-28 Zeyuan Xuan , Smadar Naoz , Kyle Kremer , Michael L. Katz , Bence Kocsis , Erez Michaely

The proposed space gravitational wave (GW) detector LISA has potential to detect stellar-mass black hole binaries (BBHs). The majority of the detected BBHs are expected to emit nearly monochromatic GWs, whose frequency evolution will be…

General Relativity and Quantum Cosmology · Physics 2024-11-21 Naoki Seto

A significant fraction of compact-object mergers in galactic nuclei are expected to be eccentric in the Laser Interferometer Space Antenna (LISA) frequency sensitivity range, $10^{-4} - 10^{-1}\ \rm Hz$. Several compact binaries detected by…

High Energy Astrophysical Phenomena · Physics 2026-02-04 Evgeni Grishin , Isobel M. Romero-Shaw , Alessandro A. Trani

It was recently suggested that the merger of $\sim30\,M_\odot$ primordial black holes (PBHs) may provide a significant number of events in gravitational-wave observatories over the next decade, if they make up an appreciable fraction of the…

High Energy Astrophysical Phenomena · Physics 2016-10-12 Ilias Cholis , Ely D. Kovetz , Yacine Ali-Haïmoud , Simeon Bird , Marc Kamionkowski , Julian B. Muñoz , Alvise Raccanelli

Supermassive black hole binaries (SMBHBs) are expected to be detected by the future space-based gravitational-wave detector LISA with a large signal-to-noise ratio (SNR). This prospect enhances the possibility of differentiating higher…

General Relativity and Quantum Cosmology · Physics 2024-10-01 Chantal Pitte , Quentin Baghi , Sylvain Marsat , Marc Besançon , Antoine Petiteau

We investigate a purely stellar dynamical solution to the Final Parsec Problem. Galactic nuclei resulting from major mergers are not spherical, but show some degree of triaxiality. With $N$-body simulations, we show that massive black hole…

Astrophysics of Galaxies · Physics 2015-05-27 Miguel Preto , Ingo Berentzen , Peter Berczik , Rainer Spurzem

The Laser Interferometer Space Antenna's (LISA's) observation of supermassive binary black holes (SMBBH) could provide a new tool for precision cosmography. Inclusion of sub-dominant signal harmonics in the inspiral signal allows for…

General Relativity and Quantum Cosmology · Physics 2014-11-20 Chris Van Den Broeck , M. Trias , B. S. Sathyaprakash , A. M. Sintes

We open the discussion into how the Laser Interferometer Space Antenna (LISA) observations of supermassive black-hole (SMBH) mergers (in the mass range ~10^6-10^8 Msun) may be complementary to pulsar timing-based gravitational wave…

We determine the main properties of the Galactic binary black hole (BBH) population detectable by LISA and strategies to distinguish them from the much more numerous white dwarf binaries. We simulate BBH populations based on cosmological…

Astrophysics of Galaxies · Physics 2020-03-18 Alberto Sesana , Astrid Lamberts , Antoine Petiteau

We evaluate the cosmological coalescence and detection rates for massive black hole (MBH) binaries targeted by the gravitational wave observatory Laser Interferometer Space Antenna (LISA). Our calculation starts with a population of…

Astrophysics of Galaxies · Physics 2022-07-20 Kunyang Li , Tamara Bogdanović , David R. Ballantyne , Matteo Bonetti

The recent Advanced LIGO detections of coalescing black hole binaries (BHBs) imply a large population of such systems emitting at milli-Hz frequencies, accessible to the Laser Interferometer Space Antenna (LISA). We show that these systems…

Cosmology and Nongalactic Astrophysics · Physics 2018-02-28 Walter Del Pozzo , Alberto Sesana , Antoine Klein

Stellar-mass binary black holes may have circumbinary disks if formed through common-envelope evolution or within gaseous environments. Disks can drive binaries into wider and more eccentric orbits, while gravitational waves harden and…

High Energy Astrophysical Phenomena · Physics 2024-10-29 Isobel M. Romero-Shaw , Samir Goorachurn , Magdalena Siwek , Christopher J. Moore

Up to hundreds of black hole binaries individually resolvable by eLISA will coalesce in the Advanced LIGO/Virgo band within ten years, allowing for multi-band gravitational wave observations. Binaries formed via dynamical interactions in…

General Relativity and Quantum Cosmology · Physics 2016-09-14 Atsushi Nishizawa , Emanuele Berti , Antoine Klein , Alberto Sesana

We consider the formation of binary intermediate black holes (BIMBH) in globular clusters (GC), which could happen either in situ or due to the mergers between clusters. We simulate the evolution of the BIMBH orbit (and its subsequent…

Astrophysics of Galaxies · Physics 2020-09-16 Alexander Rasskazov , Giacomo Fragione , Bence Kocsis

The detection of gravitational waves (GWs) by ground-based laser interferometer GW observatories (LIGO/Virgo) reveals a population of stellar binary black holes (sBBHs) with (total) masses up to $\sim 150M_\odot$, which are potential…

High Energy Astrophysical Phenomena · Physics 2022-02-01 Ju Chen , Changshuo Yan , Youjun Lu , Yuetong Zhao , Junqiang Ge

We study the orbital evolution of black hole (BH) binaries in quadruple systems, where the tertiary binary excites large eccentricity in the BH binary through Lidov-Kozai (LK) oscillations, causing the binary BHs to merge via gravitational…

High Energy Astrophysical Phenomena · Physics 2018-12-27 Bin Liu , Dong Lai

A number of scenarios have been proposed for the origin of the supermassive black holes (SMBHs) that are found in the centres of most galaxies. Many such scenarios predict a high-redshift population of massive black holes (MBHs), with…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-19 Joseph E. Plowman , Ronald W. Hellings , Sachiko Tsuruta

Recent numerical simulations have suggested the possibility of forming double intermediate mass black holes (IMBHs) via the collisional runaway scenario in young dense star clusters. The two IMBHs formed would exchange into a common binary…

Multi-frequency gravitational wave (GW) observations are useful probes of the formation processes of coalescing stellar-mass binary black holes (BBHs). We discuss the phase drift in the GW inspiral waveform of the merging BBH caused by its…

High Energy Astrophysical Phenomena · Physics 2017-10-04 Kohei Inayoshi , Nicola Tamanini , Chiara Caprini , Zoltan Haiman