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space-time configurationsvacuum (elementary particles)/ gravitational radiation reactionsecond-order perturbation theorybackground vacuum spacetime metricfirst-order metric perturbationtidal distortionRiemann tensorA point particle of small mass m moves in free fall through a background vacuum spacetime metric ...
As an alternative distance measure one can use the travel time. This requires the choice of a time function, i.e., of a function t that slices the spacetime into spacelike hypersurfaces t = constant. (Such a time function globally exists if and only if the spacetime is stably causal; se...
Well, gravitational waves were detected by the advanced Laser Interferometer Gravitational-Wave Observtory, or LIGO for short. The study was based on the observation of difference in time taken by light to travel in the event of a space time distortion. ...
Gravitational lensing (Schneider et al., 1992) is the study of the deflection of light rays from their straight Euclidean path due to the curvature of space-time caused by the presence of matter or energy. Whereas only a curiosity several decades ago, gravitational lensing has rapidly developed...
"They will carry information about their origins that is free of the distortion or alteration suffered by electromagnetic radiation as it travels through millions of light-years of intergalactic space," they added. "With this completely new way of examining astrophysical objects and phenomena, gravita...
“There are a couple of Chinese projects[TianQin and Taiji]and a European-NASA project[LISA]to build space-based gravitational-wave detectors,” Hazboun said, “and those are actually sensitive in the region of the frequency band between pulsar timing at the really low end and LIGO at the hi...
The study of black hole (BH) spacetimes represents a crucial area of investigation within the realm of general relativity and other gravitational theories [1,2,3,4]. BHs offer a unique window into our understanding of gravitation, thermodynamics, and quantum effects in curved spacetime. Recent ...
Time-delay interferometry An algebraic method to produce linear combinations of interferometry signals from separated spacecraft used in LISA that subtracts the intrinsic phase noise of the lasers, while retaining the gravitational-wave signal. Planetary ephemerides A precise measure of the trajectory of...
In astrophysics, a gravitational lens is a matter distribution (e.g., a black hole) able to bend the trajectory of transiting light, similar to an optical lens. Such apparent distortion is caused by the curvature of the geometry of space-time around the massive body acting as a lens, a ...