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Pulsar timing arrays (PTAs) are used to search for long-wavelength gravitational waves (GWs) by monitoring a set of spin-stable millisecond pulsars. Most theoretical analyses assume that the relevant GW sources are much more distant from…

星系天体物理 · 物理学 2018-01-03 Dustin R. Madison , David F. Chernoff , James M. Cordes

With the strong evidence for a gravitational wave (GW) background in the nanohertz frequency band from pulsar timing arrays, the detection of continuous GWs from individual supermassive black hole binaries is already at the dawn. Utilizing…

广义相对论与量子宇宙学 · 物理学 2024-10-23 Dicong Liang , Siyuan Chen , Chao Zhang , Lijing Shao

With pulsar timing arrays (PTAs) having observed a gravitational wave background (GWB) at nanohertz frequencies, the focus of the field is shifting towards determining and characterizing its origin. While the primary candidate is a…

天体物理仪器与方法 · 物理学 2025-09-10 Kyle A. Gersbach , Stephen R. Taylor , Bence Bécsy , Anna-Malin Lemke , Andrea Mitridate , Nihan Pol

Studies have shown that the use of pulsar timing arrays (PTAs) is among the approaches with the highest potential to detect very low-frequency gravitational waves in the near future. Although the capture of gravitational waves (GWs) by PTAs…

天体物理仪器与方法 · 物理学 2020-10-13 MengNi Chen , Yuanhong Zhong , Yi Feng , Di Li , Jin Li

Pulsar Timing Array (PTA) observations hinted towards the existence of a stochastic gravitational wave background (SGWB) in the nHz frequency band. Still, the nature of the SGWB signal cannot be confidently inferred from current data, and…

宇宙学与河外天体物理 · 物理学 2024-04-04 Stanislav Babak , Mikel Falxa , Gabriele Franciolini , Mauro Pieroni

Pulsar timing arrays (PTAs) are approaching the sensitivity required to resolve gravitational waves (GWs) from individual supermassive black hole (SMBH) binaries. However, the large uncertainty in source localization will make the…

高能天体物理现象 · 物理学 2025-08-26 Niccolo Veronesi , Maria Charisi , Stephen R Taylor , Jessie Runnoe , Daniel J D'Orazio

We have begun an exciting era for gravitational wave detection, as several world-leading experiments are breaching the threshold of anticipated signal strengths. Pulsar timing arrays (PTAs) are pan-Galactic gravitational wave detectors that…

天体物理仪器与方法 · 物理学 2015-11-26 Sarah Burke-Spolaor

The recent detection of nanohertz stochastic gravitational-wave backgrounds (SGWBs) by pulsar timing arrays (PTAs) promises unique insights into astrophysical and cosmological origins. However, traditional Markov Chain Monte Carlo (MCMC)…

宇宙学与河外天体物理 · 物理学 2025-06-12 Junrong Lai , Changhong Li

Pulsar timing arrays (PTAs) are anticipated to detect the stochastic gravitational wave background (GWB) from supermassive binary black holes (BBHs) as well as the gravitational waves from individual BBHs. Recently, a common process signal…

高能天体物理现象 · 物理学 2023-06-21 Yunfeng Chen , Qingjuan Yu , Youjun Lu

Pulsar-timing arrays (PTAs) are in the near future expected to detect a stochastic gravitational-wave background (SGWB) produced by a population of inspiralling super-massive black hole binaries. In this work, we consider a background that…

宇宙学与河外天体物理 · 物理学 2022-07-20 Gabriela Sato-Polito , Marc Kamionkowski

Pulsar Timing Array (PTA) experiments have entered a new era with evidence for a nanoHertz gravitational wave background (GWB). This review describes the physics of detection, detailing the noise models and cross-correlation techniques…

Supermassive black hole binary systems (SMBHBs) should be the most powerful sources of gravitational waves (GWs) in the Universe. Once Pulsar Timing Arrays (PTAs) detect the stochastic GW background from their cosmic merger history,…

高能天体物理现象 · 物理学 2023-06-26 Nicole M. Khusid , Chiara M. F. Mingarelli , Priyamvada Natarajan , J. Andrew Casey-Clyde , Anna Barnacka

Massive black holes are key ingredients of the assembly and evolution of cosmic structures. Pulsar Timing Arrays (PTAs) currently provide the only means to observe gravitational radiation from massive black hole binary systems with masses…

宇宙学与河外天体物理 · 物理学 2010-05-27 A. Sesana , A. Vecchio

The observation of massive black hole binaries (MBHBs) with Pulsar Timing Arrays (PTAs) is one of the goals of gravitational wave astronomy in the coming years. Massive (>10^8 solar masses) and low-redshift (< 1.5) sources are expected to…

宇宙学与河外天体物理 · 物理学 2010-05-19 Alberto Sesana , Alberto Vecchio

Nanohertz gravitational waves (GWs) from supermassive binary black holes (SMBBHs), detectable via pulsar timing arrays (PTAs), offer a novel avenue to constrain dark energy. Based on cosmological simulations and semi-analytic galaxy…

宇宙学与河外天体物理 · 物理学 2026-03-10 Qing Yang , Gu-yue Zhang , Yi Huang , Xiao Guo

Using public pulse time-of-arrival data from five pulsar timing arrays (PTAs), we search for a stationary, isotropic, and unpolarized nHz stochastic gravitational-wave background (SGWB). This analysis is more sensitive than previous…

宇宙学与河外天体物理 · 物理学 2026-04-29 Wang-Wei Yu , Bruce Allen

Large-area sky surveys show that massive galaxies undergo at least one major merger in a Hubble time. Ongoing pulsar timing array (PTA) experiments are aimed at measuring the gravitational wave (GW) emission from binary supermassive black…

宇宙学与河外天体物理 · 物理学 2015-06-22 V. Ravi , J. S. B. Wyithe , R. M. Shannon , G. Hobbs

With strong evidence of a common-spectrum stochastic process in the most recent datasets from the NANOGrav Collaboration, the European Pulsar Timing Array (PTA), Parkes PTA, and the International PTA, it is crucial to assess the effects of…

The sensitivity of ongoing searches for gravitational wave (GW) sources in the ultra-low frequency regime ($10^{-9}$ Hz to $10^{-7}$ Hz) using Pulsar Timing Arrays (PTAs) will continue to increase in the future as more well-timed pulsars…

天体物理仪器与方法 · 物理学 2022-07-22 Yi-Qian Qian , Soumya D. Mohanty , Yan Wang