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Formation of binary black holes (BBHs) detected by gravitational-wave (GW) observations could be broadly divided into two categories: those formed through field binary evolution and those assembled dynamically in dense stellar systems. The…

High Energy Astrophysical Phenomena · Physics 2020-04-01 Mohammadtaher Safarzadeh

A population of more than 50 binary black hole mergers has now been observed by the LIGO and Virgo gravitational-wave observatories. While neutron stars are known to have large velocities associated with impulsive kicks imparted to them at…

High Energy Astrophysical Phenomena · Physics 2022-03-02 Simon Stevenson

The spin-orbit tilt angles $\theta_{1(2)}$ of merging stellar-mass black holes provide key insights into their astrophysical origin. Non-parametric population modelling of The LIGO, Virgo, and KAGRA Collaborations (2025a, arXiv:2508.18083)…

High Energy Astrophysical Phenomena · Physics 2026-04-01 Jakob Stegmann , Fabio Antonini , Aleksandra Olejak , Sylvia Biscoveanu , Vivien Raymond , Stefano Rinaldi , Elizabeth Flanagan

Understanding binary black hole (BBH) dynamics in dense star clusters is key to interpreting the gravitational wave detections by LIGO and Virgo. Here, we perform $N$-body simulations of star clusters, focusing on BBH formation mechanisms,…

Astrophysics of Galaxies · Physics 2025-02-14 Jordan Barber , Fabio Antonini

The Advanced LIGO and Virgo detectors have now observed approximately 50 black-hole-binary mergers, from which we can begin to infer how rapidly astrophysical black holes spin. The LIGO-Virgo Collaboration (LVC) analysis of detections up to…

General Relativity and Quantum Cosmology · Physics 2022-04-26 Charlie Hoy , Stephen Fairhurst , Mark Hannam , Vaibhav Tiwari

The current interpretation of LIGO--Virgo--KAGRA data suggests that the primary mass function of merging binary black holes (BBHs) at redshift $z\lesssim 1$ contains multiple structures, while spins are relatively low. Theoretical models of…

Astrophysics of Galaxies · Physics 2023-03-23 Manuel Arca Sedda , Michela Mapelli , Matthew Benacquista , Mario Spera

The spin distribution of binary black hole mergers contains key information concerning the formation channels of these objects, and the astrophysical environments where they form, evolve and coalesce. To quantify the suitability of deep…

General Relativity and Quantum Cosmology · Physics 2020-08-27 Asad Khan , E. A. Huerta , Arnav Das

Binary black holes (BBHs) are one of the endpoints of isolated binary evolution, and their mergers a leading channel for gravitational wave events. Here, using the evolutionary code \textsc{StarTrack}, we study the statistical properties of…

High Energy Astrophysical Phenomena · Physics 2018-04-19 Rosalba Perna , Martyna Chruslinska , Alessandra Corsi , Krzysztof Belczynski

We study the population properties of merging binary black holes in the second LIGO--Virgo Gravitational-Wave Transient Catalog assuming they were all formed dynamically in gravitationally bound clusters. Using a phenomenological population…

The astrophysical formation channels of binary black hole systems predict correlations between their mass, spin, and redshift distributions, which can be probed with gravitational-wave observations. Population-level analysis of the latest…

High Energy Astrophysical Phenomena · Physics 2023-12-05 Jack Heinzel , Sylvia Biscoveanu , Salvatore Vitale

Several astrophysical scenarios have been proposed to explain the origin of the population of binary black hole (BBH) mergers detected in gravitational waves (GWs) by the LIGO/Virgo Collaboration. Among them, BBH mergers assembled…

High Energy Astrophysical Phenomena · Physics 2021-06-08 Giacomo Fragione , Sambaran Banerjee

We study the formation of coalescing binary black holes via the evolution of isolated field binaries that go through the common envelope phase in order to obtain the combined distributions of the main observables of Advanced LIGO. We used a…

The most general bound binary black hole (BBH) system has an eccentric orbit and precessing spins. The detection of such a system with significant eccentricity close to the merger would be a clear signature of dynamical formation. In order…

General Relativity and Quantum Cosmology · Physics 2025-12-12 Khun Sang Phukon , Nathan K. Johnson-McDaniel , Amitesh Singh , Anuradha Gupta

While the origin of merging black-hole binaries observed in gravitational waves remain uncertain, different formation channels are expected to leave distinct imprints on their observed mass and spin distributions. In this work, we focus on…

High Energy Astrophysical Phenomena · Physics 2026-05-26 Asad Hussain , Maximiliano Isi , Aaron Zimmerman

We present the mass--spin diagram for classifying black holes and studying their formation pathways providing an analogue to the Hertzsprung-Russell diagram. This allows for black hole evolutionary tracks as a function of redshift,…

High Energy Astrophysical Phenomena · Physics 2025-11-25 Nathan Steinle , Samar Safi-Harb

With the growing number of binary black hole (BBH) mergers detected by LIGO/Virgo/KAGRA, several systems have become difficult to explain via isolated binary evolution, having components in the pair-instability mass gap, high orbital…

High Energy Astrophysical Phenomena · Physics 2023-06-30 Rachel C. Zhang , Giacomo Fragione , Chase Kimball , Vicky Kalogera

The observation of gravitational waves from multiple compact binary coalescences by the LIGO-Virgo-KAGRA detector networks has enabled us to infer the underlying distribution of compact binaries across a wide range of masses, spins, and…

General Relativity and Quantum Cosmology · Physics 2023-11-01 Anarya Ray , Ignacio Magaña Hernandez , Siddharth Mohite , Jolien Creighton , Shasvath Kapadia

Gravitational-wave observations provide the unique opportunity of studying black hole formation channels and histories -- but only if we can identify their origin. One such formation mechanism is the dynamical synthesis of black hole…

General Relativity and Quantum Cosmology · Physics 2024-05-15 Ethan Payne , Kyle Kremer , Michael Zevin

Gravitational-wave detectors are unveiling a population of binary black hole (BBH) mergers out to redshifts $z \approx 1$, and are starting to constrain how the BBH population evolves with redshift. We present predictions for the redshift…

High Energy Astrophysical Phenomena · Physics 2024-06-05 Claire S. Ye , Maya Fishbach

The growing population of binary black holes (BBHs) observed by gravitational wave detectors is a potential Rosetta stone for understanding their formation channels. Here, we use an upgraded version of our semi-analytic codes {\sc…

High Energy Astrophysical Phenomena · Physics 2022-03-02 Michela Mapelli , Yann Bouffanais , Filippo Santoliquido , Manuel Arca Sedda , M. Celeste Artale