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Gravitational-wave astronomy provides a unique new way to study the expansion history of the Universe. In this work, we investigate the impact future gravitational-wave observatories will have on cosmology. Third-generation observatories…

Cosmology and Nongalactic Astrophysics · Physics 2021-03-03 Zhi-Qiang You , Xing-Jiang Zhu , Gregory Ashton , Eric Thrane , Zong-Hong Zhu

The merger rate density evolution of binary compact objects and the properties of their host galaxies carry crucial information to understand the sources of gravitational waves. Here, we present galaxyRate, a new code that estimates the…

High Energy Astrophysical Phenomena · Physics 2022-09-29 Filippo Santoliquido , Michela Mapelli , M. Celeste Artale , Lumen Boco

The gravitational-wave signal from the merger of two neutron stars cannot be easily differentiated from the signal produced by a comparable-mass mixed binary of a neutron star and a black hole. Indeed, both binary types can account for the…

High Energy Astrophysical Phenomena · Physics 2020-04-24 Hsin-Yu Chen , Katerina Chatziioannou

Gravitational-wave (GW) observations of binary black-hole (BBH) coalescences are expected to address outstanding questions in astrophysics, cosmology, and fundamental physics. Realizing the full discovery potential of upcoming…

General Relativity and Quantum Cosmology · Physics 2025-11-11 Arnab Dhani , Sebastian H. Völkel , Alessandra Buonanno , Hector Estelles , Jonathan Gair , Harald P. Pfeiffer , Lorenzo Pompili , Alexandre Toubiana

The dark and dynamic parts of the Galaxy, including the bulk shape and movement of the Galactic Bulge and characteristics of dark compact object populations, such as a hypothetical population of primordial black holes (PBHs), are difficult…

Astrophysics of Galaxies · Physics 2025-03-31 Scott E. Perkins , Peter McGill , William A. Dawson , Ming-Feng Ho , Natasha S. Abrams , Simeon Bird , Jessica R. Lu

The observations of gravitational wave (GW) provide us a new probe to study the universe. GW events can be used as standard sirens if their redshifts are measured. Normally, stardard sirens can be divided into bright/dark sirens according…

High Energy Astrophysical Phenomena · Physics 2024-01-24 Jiming Yu , Zhengyan Liu , Xiaohu Yang , Yu Wang , Pengjie Zhang , Xin Zhang , Wen Zhao

(Abridged) While the gravitational-wave (GW) signal GW170817 was accompanied by a variety of electromagnetic (EM) counterparts, sufficiently high-mass binary neutron star (BNS) mergers are expected to be unable to power bright EM…

High Energy Astrophysical Phenomena · Physics 2020-05-13 An Chen , Nathan K. Johnson-McDaniel , Tim Dietrich , Reetika Dudi

The detection of gravitational waves (GW) with an electromagnetic counterpart enabled the first Hubble Constant $H_0$ measurement through the standard siren method. Current constraints suggest that $\sim 20-30\%$ of LIGO/Virgo/KAGRA (LVK)…

Cosmology and Nongalactic Astrophysics · Physics 2024-09-20 Clecio R. Bom , Antonella Palmese

A likely source of a gravitational-wave background (GWB) in the frequency band of the Advanced LIGO, Virgo and KAGRA detectors is the superposition of signals from the population of unresolvable stellar-mass binary-black-hole (BBH) mergers…

General Relativity and Quantum Cosmology · Physics 2023-05-24 Jessica Lawrence , Kevin Turbang , Andrew Matas , Arianna I. Renzini , Nick van Remortel , Joseph D. Romano

Gravitational waves (GWs) serve as standard sirens by directly encoding the luminosity distance to their source. When the host galaxy redshift is known, for example, through observation of an electromagnetic (EM) counterpart, GW detections…

Cosmology and Nongalactic Astrophysics · Physics 2025-11-10 Madison VanWyngarden , Maya Fishbach , Aditya Vijaykumar , Alexandra G. Guerrero , Daniel E. Holz

The observation of multiple images from a strongly lensed gravitational wave (GW) source provides the observer with a stereoscopic view of the source. This allows for a measure of its relative proper motion by comparing the induced GW…

High Energy Astrophysical Phenomena · Physics 2025-11-25 Johan Samsing , Lorenz Zwick , Pankaj Saini , János Takátsy

Stellar mass can enhance the ranking of potential hosts for compact binary coalescences identified by ground-based gravitational-wave detectors within large localisation areas containing even thousands of galaxies. Despite its benefits,…

Astrophysics of Galaxies · Physics 2025-03-27 M. Pálfi , G. Dálya , P. Raffai

Gravitational waves (GWs) with electromagnetic counterparts (EMc) offer a novel approach to measure the Hubble constant ($H_0$), known as bright sirens, enabling $H_0$ measurements by combining GW-derived distances with EM-derived…

Cosmology and Nongalactic Astrophysics · Physics 2025-12-08 Yejing Zhan , David Izquierdo-Villalba , Xiao Guo , Qing Yang , Daniele Spinoso , Fa-Yin Wang

Gravitational waves (GWs) have enabled direct detections of compact binary coalescences (CBCs). However, their poor sky localisation and the typical lack of observable electromagnetic (EM) counterparts make it difficult to confidently…

High Energy Astrophysical Phenomena · Physics 2025-10-17 Avinash Tiwari , Aditya Vijaykumar , Shasvath J. Kapadia , Sourav Chatterjee , Giacomo Fragione

The coalescence of massive black hole binaries (BHBs) in galactic mergers is the primary source of gravitational waves (GWs) at low frequencies. Current estimates of GW detection rates for the Laser Interferometer Space Antenna and the…

Astrophysics of Galaxies · Physics 2020-07-08 Imran Nasim , Alessia Gualandris , Justin Read , Walter Dehnen , Maxime Delorme , Fabio Antonini

The Laser Interferometer Gravitational-Wave Observatory (LIGO) and Virgo Interferometer Collaborations have now detected all three classes of compact binary mergers: binary black hole (BBH), binary neutron star (BNS), and neutron star-black…

Instrumentation and Methods for Astrophysics · Physics 2023-03-20 Richard Qiu , Plamen Krastev , Kiranjyot Gill , Edo Berger

Wide black hole binaries (wide-BBHs; $\geqslant 10^3$ AU) in the field can be perturbed by random stellar flybys that excite their eccentricities. Once a wide binary is driven to a sufficiently small pericenter approach, gravitational wave…

High Energy Astrophysical Phenomena · Physics 2022-06-22 Yael Raveh , Erez Michaely , Hagai Binyamin Perets

Current searches for gravitational waves (GWs) from black hole binaries using the LIGO and Virgo observatories are limited to analytical models for systems with black hole spins aligned (or anti-aligned) with the orbital angular momentum of…

General Relativity and Quantum Cosmology · Physics 2024-07-26 Chetan Verma , Amit Reza , Gurudatt Gaur , Dilip Krishnaswamy , Sarah Caudill

Gravitational waves (GWs) originated from mergers of stellar-mass binary black holes (SBBHs) are considered as dark sirens in cosmology since they usually do not have electromagnetic counterparts. In order to study cosmos with these events,…

Cosmology and Nongalactic Astrophysics · Physics 2022-11-23 Muxin Liu , Chang Liu , Yi-Ming Hu , Lijing Shao , Yacheng Kang

Lensed gravitational wave (GW) events are expected to be powerful new probes of cosmology, contingent on redshift measurement by electromagnetic observations. Host galaxy identification is thus crucial but challenging due to poor…

Cosmology and Nongalactic Astrophysics · Physics 2025-10-15 Zhiwei Chen , Qingjuan Yu , Youjun Lu , Xiao Guo