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We explore a novel process in the early Universe in which thermalized photons are converted into gravitons in the presence of strong primordial magnetic fields. It is found that the frequency of generated gravitational waves (GWs) is…

Cosmology and Nongalactic Astrophysics · Physics 2020-11-19 Tomohiro Fujita , Kohei Kamada , Yuichiro Nakai

Long-term precise timing of Galactic millisecond pulsars holds great promise for measuring the long-period (months-to-years) astrophysical gravitational waves. Several gravitational-wave observational programs, called Pulsar Timing Arrays…

Astrophysics · Physics 2009-11-13 Rutger van Haasteren , Yuri Levin , Patrick McDonald , Tingting Lu

The millihertz gravitational wave band is expected to be opened by space-borne detectors like TianQin. Various mechanisms can produce short outbursts of gravitational waves, whose actual waveform can be hard to model. In order to identify…

General Relativity and Quantum Cosmology · Physics 2024-05-15 Zheng Wu , Hui-Min Fan , Yi-Ming Hu , Ik Siong Heng

Atomic clocks have recently reached a fractional timing precision of $<10^{-18}$. We point out that an array of atomic clocks, distributed along the Earth's orbit around the Sun, will have the sensitivity needed to detect the time dilation…

Instrumentation and Methods for Astrophysics · Physics 2015-01-29 Abraham Loeb , Dan Maoz

Gravitational wave detectors are already operating at interesting sensitivity levels, and they have an upgrade path that should result in secure detections by 2014. We review the physics of gravitational waves, how they interact with…

General Relativity and Quantum Cosmology · Physics 2015-05-13 B. S. Sathyaprakash , B. F. Schutz

Light undergoes perturbation as gravitational waves pass by. This is shown by solving Maxwell's equations in a spacetime with gravitational waves; a solution exhibits a perturbation due to gravitational waves. We determine the perturbation…

General Relativity and Quantum Cosmology · Physics 2021-07-05 Dong-Hoon Kim , Chan Park

The steadily improving sensitivity of pulsar timing arrays (PTAs) suggests that gravitational waves (GWs) from supermassive black hole binary (SMBHB) systems in the nearby universe will be de- tectable sometime during the next decade.…

Cosmology and Nongalactic Astrophysics · Physics 2014-03-07 Joseph Simon , Abigail Polin , Andrea Lommen , Ben Stappers , Lee Samuel Finn , F A Jenet , B Christy

During their most recent observing run, LIGO/Virgo reported the gravitational wave (GW) transient S191110af, a burst signal at a frequency of 1.78 kHz that lasted for 0.104 s. While this signal was later deemed non-astrophysical, genuine…

General Relativity and Quantum Cosmology · Physics 2020-05-07 Wynn C. G. Ho , D. I. Jones , Nils Andersson , Cristobal M. Espinoza

We propose a novel method for detecting gravitational waves (GW), where a light signal emitted from a distant star interacts with a local (also distant) GW source and travels towards the Earth, where it is detected. While traveling in the…

Astrophysics · Physics 2009-11-13 G. B. Lesovik , A. V. Lebedev , V. Mounutcharyan , T. Martin

A major challenge of any search for gravitational waves is to distinguish true astrophysical signals from those of terrestrial origin. Gravitational-wave experiments therefore make use of multiple detectors, considering only those signals…

Instrumentation and Methods for Astrophysics · Physics 2017-08-01 T. A. Callister , J. B. Kanner , T. J. Massinger , S. Dhurandhar , A. J. Weinstein

Recent years have seen a burgeoning interest in using pulsar timing arrays (PTAs) as gravitational-wave (GW) detectors. To date, that interest has focused mainly on three particularly promising source types: supermassive--black-hole…

General Relativity and Quantum Cosmology · Physics 2014-02-26 Curt Cutler , Sarah Burke-Spolaor , Michele Vallisneri , Joseph Lazio , Walid Majid

Gravitational Waves (GWs) are tiny ripples in the fabric of space-time predicted by Einstein's General Relativity. Pulsar timing arrays (PTAs) are well poised to detect low frequency ($10^{-9}$ -- $10^{-7}$ Hz) GWs in the near future. There…

Instrumentation and Methods for Astrophysics · Physics 2015-06-04 J. A. Ellis , F. A. Jenet , M. A. McLaughlin

This work for the first time addresses the feasibility of measuring millihertz gravitational waves (mHz GWs) with a storage ring-based detector. While this overall challenge consists of several partial problems, here we focus solely on…

General Relativity and Quantum Cosmology · Physics 2024-10-11 Thorben Schmirander , Velizar Miltchev , Suvrat Rao , Marcus Brüggen , Florian Grüner , Wolfgang Hillert , Jochen Liske

Gravitational waves (GWs) can resonate with magnetic fields through the Gertsenshtein-Zeldovich effect, producing electromagnetic signals at the same frequency. In pulsar magnetospheres, this conversion may yield a faint radio-band signal…

General Relativity and Quantum Cosmology · Physics 2026-05-22 Wei Hong , Peng He , Tong-Jie Zhang , Shi-Yu Li , Pei Wang

Continuous gravitational waves from rapidly rotating neutron stars are on the new frontiers of gravitational wave astrophysics and have strong connections to electromagnetic astronomy, nuclear astrophysics, and condensed matter physics. In…

General Relativity and Quantum Cosmology · Physics 2026-03-13 Benjamin J. Owen

A novel method for extending frequency frontier in gravitational wave observations is proposed. It is shown that gravitational waves can excite a magnon. Thus, gravitational waves can be probed by a graviton-magnon detector which measures…

General Relativity and Quantum Cosmology · Physics 2020-03-03 Asuka Ito , Tomonori Ikeda , Kentaro Miuchi , Jiro Soda

By reaching through shrouding blastwaves, efficiently discovering off-axis events, and probing the central engine at work, gravitational wave (GW) observations will soon revolutionize the study of gamma-ray bursts. Already, analyses of GW…

Cosmology and Nongalactic Astrophysics · Physics 2013-05-16 Imre Bartos , Patrick Brady , Szabolcs Marka

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…

Instrumentation and Methods for Astrophysics · Physics 2020-10-13 MengNi Chen , Yuanhong Zhong , Yi Feng , Di Li , Jin Li

Dark compact objects ("clumps") transiting the Solar System exert accelerations on the test masses (TM) in a gravitational-wave (GW) detector. We reexamine the detectability of these clump transits in a variety of current and future GW…

Cosmology and Nongalactic Astrophysics · Physics 2024-10-17 Sebastian Baum , Michael A. Fedderke , Peter W. Graham

We investigate the production and detection of gravitational waves (GWs) within the framework of Gravitational Quantum Field Theory (GQFT). In this theory, GWs exhibit five propagating modes: one scalar, two vector, and two tensor modes.…

General Relativity and Quantum Cosmology · Physics 2025-06-27 Yuan-Kun Gao , Da Huang , Yue-Liang Wu