Results 21 to 30 of about 2,732,923 (363)

Probe the gravitational constant variation via the propagation of gravitational waves [PDF]

open access: yesPhysics Letters B, Volume 848, January 2024, 138350, 2023
The gravitational constant variation means the breakdown of the strong equivalence principle. As the cornerstone of general relativity, the validity of general relativity can be examined by studying the gravitational constant variation. Such variations have the potential to affect both the generation and propagation of gravitational waves.
arxiv   +1 more source

Gravitational waves from first-order cosmological phase transitions: lifetime of the sound wave source [PDF]

open access: yesJournal of Cosmology and Astroparticle Physics, 2020
We survey systematically the general parametrisations of particle-physics models for a first-order phase transition in the early universe, including models with polynomial potentials both with and without barriers at zero temperature, and Coleman ...
J. Ellis, M. Lewicki, J. No
semanticscholar   +1 more source

Metric reconstruction from celestial multipoles

open access: yesJournal of High Energy Physics, 2022
The most general vacuum solution to Einstein’s field equations with no incoming radiation can be constructed perturbatively from two infinite sets of canonical multipole moments, which are found to be mapped into each other under gravitational electric ...
Geoffrey Compère   +2 more
doaj   +1 more source

CMB-S4: Forecasting Constraints on Primordial Gravitational Waves [PDF]

open access: yesAstrophysical Journal, 2020
CMB-S4—the next-generation ground-based cosmic microwave background (CMB) experiment—is set to significantly advance the sensitivity of CMB measurements and enhance our understanding of the origin and evolution of the universe.
The CMB-S4 Collaboration Kevork Abazajian   +234 more
semanticscholar   +1 more source

Gravitational lensing by gravitational waves [PDF]

open access: yesGravitation and Cosmology, 2008
9 pages, 3 ...
O. Yu. Tsupko   +4 more
openaire   +3 more sources

Phase transitions in an expanding universe: stochastic gravitational waves in standard and non-standard histories [PDF]

open access: yesJournal of Cosmology and Astroparticle Physics, 2020
We undertake a careful analysis of stochastic gravitational wave production from cosmological phase transitions in an expanding universe, studying both a standard radiation as well as a matter dominated history.
Huai-Ke Guo   +3 more
semanticscholar   +1 more source

Twisted gravitational waves [PDF]

open access: yesPhysical Review D, 2018
In general relativity (GR), linearized gravitational waves propagating in empty Minkowski spacetime along a fixed spatial direction have the property that the wave front is the Euclidean plane. Beyond the linear regime, exact plane waves in GR have been studied theoretically for a long time and many exact vacuum solutions of the gravitational field ...
Bini Donato   +2 more
openaire   +5 more sources

GW170814: A Three-Detector Observation of Gravitational Waves from a Binary Black Hole Coalescence. [PDF]

open access: yesPhysical Review Letters, 2017
On August 14, 2017 at 10∶30:43 UTC, the Advanced Virgo detector and the two Advanced LIGO detectors coherently observed a transient gravitational-wave signal produced by the coalescence of two stellar mass black holes, with a false-alarm rate of ≲1 in 27
B. Abbott   +499 more
semanticscholar   +1 more source

Induced gravitational waves as a probe of thermal history of the universe [PDF]

open access: yesJournal of Cosmology and Astroparticle Physics, 2020
The scalar perturbation induced gravitational waves are a probe of the primordial density perturbation spectrum on small scales. In this paper, we show that they can also probe the thermal history of the universe. We assume the universe underwent a stage
Guillem Domènech, Shi Pi, M. Sasaki
semanticscholar   +1 more source

The Poincaré and BMS flux-balance laws with application to binary systems

open access: yesJournal of High Energy Physics, 2020
Asymptotically flat spacetimes admit both supertranslations and Lorentz transformations as asymptotic symmetries. Furthermore, they admit super-Lorentz transformations, namely superrotations and superboosts, as outer symmetries associated with super ...
Geoffrey Compère   +2 more
doaj   +1 more source

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