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Stochastic gravitational-wave background (SGWB) poses significant challenges for data analysis and parameter inference in future space-based gravitational-wave missions, such as LISA and Taiji, as it appears as an additional stochastic…

General Relativity and Quantum Cosmology · Physics 2025-12-10 Jing-yi Wu , Yong Tang

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

For future configurations, we study the relation between the abatement of the noise sources and the Signal to Noise Ratio (SNR) for coalescing binaries. Our aim is not the proposition of a new design, but an indication of where in the…

General Relativity and Quantum Cosmology · Physics 2009-11-10 Alessandro D. A. M. Spallicci , Sofiane Aoudia , Jose De Freitas Pacheco , Giorgio Frossati , Tania Regimbau

Joint gravitational-wave detections of stellar-mass black-hole binaries by ground- and space-based observatories will provide unprecedented opportunities for fundamental physics and astronomy. We present a semianalytic method to estimate…

High Energy Astrophysical Phenomena · Physics 2019-05-22 Davide Gerosa , Sizheng Ma , Kaze W. K. Wong , Emanuele Berti , Richard O'Shaughnessy , Yanbei Chen , Krzysztof Belczynski

The coalescence of massive black hole (BH) binaries due to galaxy mergers provides a primary source of low-frequency gravitational radiation detectable by pulsar timing measurements and by the proposed LISA (Laser Interferometry Space…

Astrophysics · Physics 2009-11-07 J. Stuart B. Wyithe , Abraham Loeb

We present a refined estimation of the stochastic gravitational wave background (SGWB) based on observed dual active galactic nuclei (AGNs) together with AGN X-ray luminosity functions, in light of recent Pulsar Timing Array detections of…

High Energy Astrophysical Phenomena · Physics 2026-01-14 Katsunori Kusakabe , Yoshiyuki Inoue , Daisuke Toyouchi

Stars on eccentric orbits around a massive black hole (MBH) emit bursts of gravitational waves (GWs) at periapse. Such events may be directly resolvable in the Galactic centre. However, if the star does not spiral in, the emitted GWs are…

Earth and Planetary Astrophysics · Physics 2015-05-13 Silvia Toonen , Clovis Hopman , Marc Freitag

The stochastic gravitational wave background (SGWB) consists of an incoherent collection of waves from both astrophysical and cosmological sources. To distinguish the SGWB from noise, it is essential to verify its quadrupolar nature,…

General Relativity and Quantum Cosmology · Physics 2025-08-22 Yifan Chen , Yuxiang Liu , Jing Shu , Bin Xu , Xiao Xue , Yanjie Zeng

We make forecasts for the impact a future "midband" space-based gravitational wave experiment, most sensitive to $10^{-2}- 10$ Hz, could have on potential detections of cosmological stochastic gravitational wave backgrounds (SGWBs).…

General Relativity and Quantum Cosmology · Physics 2021-06-30 Barry C. Barish , Simeon Bird , Yanou Cui

In this work, we develop a Bayesian data analysis framework to study the SGWB from bosonic clouds using data from Advanced LIGO and Advanced Virgo, building on previous work by Brito et.al (2017). We further improve this model by adding a…

High Energy Astrophysical Phenomena · Physics 2019-05-29 Leo Tsukada , Thomas Callister , Andrew Matas , Patrick Meyers

The NANOGrav, PPTA, EPTA, CPTA and MPTA collaborations have reported compelling evidence for the existence of the Stochastic Gravitational-Wave Background (SGWB). This inferred background's amplitude and frequency spectrum align closely…

High Energy Astrophysical Phenomena · Physics 2025-07-08 Zhao-Qiang Shen , Guan-Wen Yuan , Yi-Ying Wang , Yuan-Zhu Wang , Yin-Jie Li , Yi-Zhong Fan

Context: The astrophysical gravitational wave background (AGWB) is a stochastic gravitational wave (GW) signal that is emitted by different populations of inspiralling binary systems containing compact objects throughout the Universe. In…

High Energy Astrophysical Phenomena · Physics 2024-10-16 Sophie Hofman , Gijs Nelemans

Massive stellar origin black hole binaries (SBHBs), originating from stars above the pair-instability mass gap, are primary candidates for multiband gravitational wave (GW) observations. Here we study the possibility to use them as…

Cosmology and Nongalactic Astrophysics · Physics 2022-02-16 Niccolò Muttoni , Alberto Mangiagli , Alberto Sesana , Danny Laghi , Walter Del Pozzo , David Izquierdo-Villalba , Mattia Rosati

Future gravitational wave detectors, such as the Laser Interferometer Space Antenna (\textit{LISA}), will be able to resolve a significant number of the ultra compact stellar-mass binaries in our own Galaxy and its neighborhood. These will…

Astrophysics of Galaxies · Physics 2022-12-21 Maria Georgousi , Nikolaos Karnesis , Valeriya Korol , Mauro Pieroni , Nikolaos Stergioulas

The gravitational wave (GW) interferometers LISA and ET are expected to be functional in the next decade(s), possibly around the same time. They will operate over different frequency ranges, with similar integrated sensitivities to the…

Cosmology and Nongalactic Astrophysics · Physics 2025-09-11 Alisha Marriott-Best , Debika Chowdhury , Anish Ghoshal , Gianmassimo Tasinato

LISA is a planned space-based gravitational-wave (GW) detector that would be sensitive to waves from low-frequency sources, in the band of roughly $(0.03 - 0.1) {\rm mHz} \lesssim f \lesssim 0.1 {\rm Hz}$. This is expected to be an…

General Relativity and Quantum Cosmology · Physics 2009-11-11 Scott A. Hughes

Extreme mass ratio inspirals (EMRIs), i.e. binary systems comprised by a compact stellar-mass object orbiting a massive black hole, are expected to be among the primary gravitational wave (GW) sources for the forthcoming LISA mission. The…

Astrophysics of Galaxies · Physics 2020-11-25 Matteo Bonetti , Alberto Sesana

Coalescing supermassive black hole binaries (SMBHBs) are the primary source candidates for low frequency gravitational wave (GW) detections, which could bring us deep insights into galaxy evolutions over cosmic time and violent processes of…

General Relativity and Quantum Cosmology · Physics 2023-07-04 Minghui Du , Qiong Deng , Yifan Bian , Ziren Luo , Peng Xu

Searching for gravitational waves (GWs) from binary black holes (BBHs) with LIGO and Virgo involves matched-filtering data against a set of representative signal waveforms --- a template bank --- chosen to cover the full signal space of…

General Relativity and Quantum Cosmology · Physics 2016-06-08 Collin Capano , Ian Harry , Stephen Privitera , Alessandra Buonanno

We present the steps to forecast the sensitivity of the Laser Interferometer Space Antenna (LISA) to both a stochastic gravitational wave background and deterministic wave sources. We show how to use these expressions to estimate the…

Cosmology and Nongalactic Astrophysics · Physics 2019-12-09 Tristan L. Smith , Robert Caldwell