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The dynamical evolution of binaries of intermediate-massive black holes (IMBHs, massive black holes with a mass ranging between $10^2$ and $10^4 M_{\odot}$) in stellar clusters has recently received an increasing amount of attention. This…

Astrophysics of Galaxies · Physics 2015-05-13 Pau Amaro-Seoane , Christoph Eichhorn , Edward K. Porter , Rainer Spurzem

Intermediate-mass black holes (IMBHs) by definition have masses of $M_{\rm IMBH} \sim 10^{2-5}~M_\odot$, a range with few observational constraints. Finding IMBHs in globular star clusters (GCs) would validate a formation channel for…

Astrophysics of Galaxies · Physics 2021-09-08 J. M. Wrobel , T. J. Maccarone , J. C. A. Miller-Jones , K. E. Nyland

Intermediate-mass black holes (IMBHs) are believed to be the missing link between the supermassive black holes (BHs) found at the centers of massive galaxies and BHs formed through stellar core collapse. One of the proposed mechanisms for…

Astrophysics of Galaxies · Physics 2024-03-14 Rujuta A. Purohit , Giacomo Fragione , Frederic A. Rasio , Grayson C. Petter , Ryan C. Hickox

We study the merger rate of dark matter PIMBHs(=Primordial Intermediate Mass Black Holes). We conclude that the black holes observed by LIGO in GW150914 and later events were probably not dark matter PIMBHs but rather the result of…

Cosmology and Nongalactic Astrophysics · Physics 2019-06-26 Paul H. Frampton

Massive black hole binary systems are among the most interesting sources for the Laser Interferometer Space Antenna (LISA); gravitational radiation emitted during the last year of in-spiral could be detectable with a very large…

General Relativity and Quantum Cosmology · Physics 2009-10-31 Alberto Vecchio

The idea that primordial black holes (PBHs) can comprise most of the dark matter of the universe has recently reacquired a lot of momentum. Observational constraints, however, rule out this possibility for most of the PBH masses, with a…

Cosmology and Nongalactic Astrophysics · Physics 2019-07-31 N. Bartolo , V. De Luca , G. Franciolini , M. Peloso , D. Racco , A. Riotto

In this paper we explore the interplay between intermediate-mass black holes (IMBHs) and their nursing globular clusters (GCs), taking advantage of over 2000 Monte Carlo GC models. We find that the average density of IMBHs sphere of…

Astrophysics of Galaxies · Physics 2019-05-06 Manuel Arca Sedda , Abbas Askar , Mirek Giersz

Recent studies suggest that numerous intermediate-mass black holes (IMBHs) may wander undetected across the Universe, emitting little radiation. These IMBHs largely preserve their birth masses, offering critical insights into the formation…

Astrophysics of Galaxies · Physics 2025-04-21 Zihao Wu , Luis C. Ho

We show that Laser Interferometer Space Antenna can uniquely identify the sites of intermediate-mass binary black hole (IMBBH) mergers if they occur in Active Galactic Nuclei (AGN) disks with a gas density $\rho\geq10^{-12} \, {\rm g/cc}$…

High Energy Astrophysical Phenomena · Physics 2025-05-16 Poulami Dutta Roy , Parthapratim Mahapatra , Anuradha Samajdar , K. G. Arun

It has been assumed that intermediate-mass black holes (IMBHs) in globular clusters can only reside in the most centrally concentrated clusters, with a so-called `core-collapsed' density profile. While this would be a natural guess, it is…

Astrophysics · Physics 2009-11-10 Holger Baumgardt , Junichiro Makino , Piet Hut

Gravitational waves from coalescences of neutron stars or stellar-mass black holes into intermediate-mass black holes (IMBHs) of $\gtrsim 100$ solar masses represent one of the exciting possible sources for advanced gravitational-wave…

High Energy Astrophysical Phenomena · Physics 2016-06-06 Carl-Johan Haster , Zhilu Wang , Christopher P. L. Berry , Simon Stevenson , John Veitch , Ilya Mandel

Intermediate-mass black holes (IMBHs) are the missing link in the cosmic hierarchy of black holes, bridging the gap between stellar-mass black holes and supermassive ones. They also serve as unique laboratories for testing strong-field…

High Energy Astrophysical Phenomena · Physics 2026-05-20 Huan Zhou , Zhengxiang Li , Cheng-Gang Shao , Xi-Jing Wang , Kai Liao , He Gao , Zong-Hong Zhu

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…

Even though the existence of intermediate-mass black holes (IMBHs, black holes with masses ranging between $10^{2-4}\,M_{\odot}$) has not yet been corroborated observationally, these objects are of high interest for astrophysics. Our…

Cosmology and Nongalactic Astrophysics · Physics 2014-11-20 Pau Amaro-Seoane , Lucia Santamaria

Intermediate-mass black holes (IMBHs), with masses in the range $100-10^{6}$ M$_{\odot}$, are the link between stellar-mass BHs and supermassive BHs (SMBHs). They are thought to be the seeds from which SMBHs grow, which would explain the…

Astrophysics of Galaxies · Physics 2017-05-30 Mar Mezcua

Intermediate-mass black holes are the missing link that connects stellar-mass to supermassive black holes and are key to understanding galaxy evolution. Gravitational waves, like photons, can be lensed, leading to discernable effects such…

General Relativity and Quantum Cosmology · Physics 2018-11-27 Kwun-Hang Lai , Otto A. Hannuksela , Antonio Herrera-Martín , Jose M. Diego , Tom Broadhurst , Tjonnie G. F. Li

We very briefly discuss proposed in the literature possible scenarios for intermediate mass black holes (IMBH) formation in globular clusters. We also discuss the results of the MOCCA simulations of about 2000 models (BigSurvey) regarding…

Astrophysics of Galaxies · Physics 2016-07-29 Mirek Giersz , Nathan Leigh , Arkadiusz Hypki , Abbas Askar , Nora Lützgendorf

Supermassive black holes are investigated as possible sources for low-frequency bursts of gravity waves. The event rate for `known' supermassive black holes at intermediate and high redshifts, inferred from the quasar luminosity function,…

Astrophysics · Physics 2015-06-24 M. G. Haehnelt

The most massive galaxies in the Universe also host the largest supermassive black holes (SMBHs), with masses of $10^9 \: \mathrm{M_{\odot}}$ and above. During their hierarchical assembly, these galaxies have experienced only a few major…

Astrophysics of Galaxies · Physics 2026-04-15 Lazaros Souvaitzis , Antti Rantala , Thorsten Naab

Stellar-mass black hole binaries (BHBs) near supermassive black holes (SMBH) in galactic nuclei undergo eccentricity oscillations due to gravitational perturbations from the SMBH. Previous works have shown that this channel can contribute…

High Energy Astrophysical Phenomena · Physics 2019-04-25 Bao-Minh Hoang , Smadar Naoz , Bence Kocsis , Will Farr , Jess McIver