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We discuss some of the key open questions regarding the formation and evolution of globular clusters (GCs) during galaxy formation and assembly within a cosmological framework. The current state-of-the-art for both observations and…

Binary systems of compact objects are strong emitters of gravitational waves whose amplitude depends on the binary orbital parameters as the component mass, the orbital semi-major axis and eccentricity. Here, in addition to the famous…

Astrophysics · Physics 2007-05-23 P. Longo , G. Congedo , A. Nucita , F. De Paolis , G. Ingrosso

We review sources of high-frequency gravitational waves, summarizing our current understanding of emission mechanisms, expected amplitudes and event rates. The most promising sources are gravitational collapse (formation of black holes or…

General Relativity and Quantum Cosmology · Physics 2017-08-23 Kostas D. Kokkotas , Nikolaos Stergioulas

We present a model for merger-driven evolution of the mass function for massive galaxies and their central supermassive black holes at late times. We discuss the current observational evidence in favor of merger-driven massive galaxy…

Cosmology and Nongalactic Astrophysics · Physics 2017-02-22 Sean T. McWilliams , Jeremiah P. Ostriker , Frans Pretorius

The stochastic gravitational wave background from compact binary coalescences is expected to be the first detectable stochastic signal via cross-correlation searches with terrestrial detectors. It encodes the cumulative merger history of…

General Relativity and Quantum Cosmology · Physics 2026-02-17 Michael Ebersold , Tania Regimbau

Gravitational waves (GWs) provide a revolutionary tool to investigate yet unobserved astrophysical objects. Especially the first stars, which are believed to be more massive than present-day stars, might be indirectly observable via the…

Astrophysics of Galaxies · Physics 2016-05-20 Tilman Hartwig , Marta Volonteri , Volker Bromm , Ralf S. Klessen , Enrico Barausse , Mattis Magg , Athena Stacy

Globular clusters formed in galactic mergers (e.g., The Antennae) can now be studied at different stages of their evolution. In young merger remnants (e.g., NGC 7252) these "second-generation" globulars appear by the hundreds as young halo…

Astrophysics · Physics 2007-05-23 Francois Schweizer

The mass and spin distributions of compact binary gravitational-wave sources are currently uncertain due to complicated astrophysics involved in their formation. Multiple sub-populations of compact binaries representing different…

High Energy Astrophysical Phenomena · Physics 2019-07-24 Jade Powell , Simon Stevenson , Ilya Mandel , Peter Tino

The discovery of the gravitational-wave source GW150914 with the Advanced LIGO detectors provides the first observational evidence for the existence of binary black-hole systems that inspiral and merge within the age of the Universe. Such…

High Energy Astrophysical Phenomena · Physics 2016-02-17 The LIGO Scientific Collaboration , the Virgo Collaboration

The gravitational wave signal of binary compact objects has two main contributions at frequencies below the characteristic merger frequency: the gravitational wave signal associated with the early inspiral stage of the binary and the…

Cosmology and Nongalactic Astrophysics · Physics 2025-10-09 Silvia Gasparotto , Gabriele Franciolini , Valerie Domcke

The detection of gravitational waves emitted during a neutron star - black hole merger and the associated electromagnetic counterpart will provide a wealth of information about stellar evolution nuclear matter, and General Relativity. While…

Astrophysics of Galaxies · Physics 2020-06-16 Manuel Arca Sedda

Third-generation (3G) gravitational-wave (GW) detectors will be able to observe binary-black-hole mergers (BBHs) up to redshift of $\sim 30$. This gives unprecedented access to the formation and evolution of BBHs throughout cosmic history.…

Cosmology and Nongalactic Astrophysics · Physics 2021-07-14 Ken K. Y. Ng , Salvatore Vitale , Will M. Farr , Carl L. Rodriguez

It is now widely established that globular clusters host robust populations of white dwarfs, neutron stars, and black holes throughout their lifetimes. Within clusters, dynamical processes enabled by stellar densities thousands to millions…

High Energy Astrophysical Phenomena · Physics 2025-08-21 Kyle Kremer

This paper addresses the questions of what we have learned about how and when dense star clusters form, and what studies of star clusters have revealed about galaxy formation and evolution. One important observation is that globular…

Astrophysics · Physics 2007-05-23 Stephen E. Zepf

In August 2017, the first detection of a binary neutron star merger, GW170817, made it possible to study neutron stars in compact binary systems using gravitational waves. Despite being the loudest gravitational wave event detected to date…

General Relativity and Quantum Cosmology · Physics 2023-01-24 Stephanie M. Brown , Collin D. Capano , Badri Krishnan

The improvements in the sensitivity of the gravitational wave (GW) network enable the detection of several large redshift GW sources by third-generation GW detectors. These advancements provide an independent method to probe the large-scale…

Cosmology and Nongalactic Astrophysics · Physics 2022-02-02 Xiaoyun Shao , Zhoujian Cao , Xilong Fan , Shichao Wu

Merging compact binaries are the one source of gravitational radiation so far identified. Because short-period systems which will merge in less than a Hubble time have already been observed as binary pulsars, they are important both as…

Cosmology and Nongalactic Astrophysics · Physics 2014-11-20 Marcel Zemp , Enrico Ramirez-Ruiz , Jürg Diemand

The detection of gravitational waves emitted by binary black holes raises questions regarding the origin of binaries. There are several models in the literature involving binary evolution in both the field and clusters. We compare the…

Astrophysics of Galaxies · Physics 2021-05-25 Maciej Ossowski

The measurement of gravitational waves produced by binary black-hole mergers at the Advanced LIGO has encouraged extensive studies on the stochastic gravitational wave background. Recent studies have focused on gravitational wave sources…

Cosmology and Nongalactic Astrophysics · Physics 2022-02-18 Wenfeng Cui , Fei Huang , Jing Shu , Yue Zhao

Observed angular positions and redshifts of large-scale structure tracers such as galaxies are affected by gravitational waves through volume distortion and magnification effects. Thus, a gravitational wave background can in principle be…

Cosmology and Nongalactic Astrophysics · Physics 2013-05-30 Donghui Jeong , Fabian Schmidt