The damping of gravitational waves in dust

Svítek, Otakar

doi:10.1088/0031-8949/79/02/025003

Cited by 5 publications

(6 citation statements)

References 10 publications

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“…This later gauge condition is particularly suitable for the fact that the metric perturbation contracts to the unperturbed 4-velocity in several terms of the perturbed field equation. By requiring (24) to hold, (23) reduces to the form 25) where the operator on the left-hand side of this formula maps the space of symmetric 'spatial' tensor field into itself. This basic equation restricted by (24) is an unconstrained system of six coupled ordinary differential equation of second order for six unknown variables.…”

Section: A Field Equation and Dynamics Of Gasmentioning

confidence: 99%

Section: A Field Equation and Dynamics Of Gasmentioning

confidence: 99%

“…Generality however also entails several disadvantages: due to the lack of specifically detailed background, alterations in the wave's amplitude and frequency cannot be determined. The procedure developed in [21][22][23] was generalized to curved backgrounds and is largely similar to that of Svítek's approach to the damping of GWs in dust cloud [24]. There the geodesic deviation equation stemed from the periodic oscillations produced within the molecules by the incoming waves.…”

Section: Introduction a Motivation And Relation To Other Workmentioning

confidence: 99%

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Dispersion of gravitational waves in cold spherical interstellar medium

Bárta

Vasúth

2018

Int. J. Mod. Phys. D

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We investigate the propagation of locally plane, small-amplitude, monochromatic gravitational waves through cold compressible interstellar gas in order to provide a more accurate picture of expected waveforms for direct detection. The quasi-isothermal gas is concentrated in a spherical symmetric cloud held together by self-gravitation. Gravitational waves can be treated as linearized perturbations on the background inner Schwarzschild spacetime. The perturbed quantities lead to the field equations governing the gas dynamics and describe the interaction of gravitational waves with matter. The resulted field equations decouple asymptotically for slowly varying short waves to a set of three PDEs of different orders of magnitude. A second-order WKB method provides transport equations for the wave amplitudes. The influence of background curvature already appears in the first-order amplitudes, which gives rise to diffraction. We have shown that the transport equation of these amplitudes provides numerical solutions for the frequency-alteration. The energy dissipating process is responsible for decreasing frequency. The decrease is significantly smaller than the magnitude of the original frequency and exhibits a power-law relationship between original and decreased frequencies. The frequency deviation was examined particularly for the transient signal GW150914. Considering AGNs as larger background structures and high-frequency signals emitted by BNS mergers, the frequency-deviation grows large enough to be relevant in future GWobservations with increased sensitivity.

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Section: A Field Equation and Dynamics Of Gasmentioning

confidence: 99%

Section: A Field Equation and Dynamics Of Gasmentioning

confidence: 99%

Section: Introduction a Motivation And Relation To Other Workmentioning

confidence: 99%

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Dispersion of gravitational waves in cold spherical interstellar medium

Bárta

Vasúth

2018

Int. J. Mod. Phys. D

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“…the modified Newtonian potential affected by the contribution of the average quadrupole moment of the medium. Lastly, in [146] is outlined the possibility of the settling of an amplitude damping, when the molecules are treated on an anti-de Sitter background.…”

Section: Gravitational Waves In Mattermentioning

confidence: 99%

The role of longitudinal polarizations in Horndeski and macroscopic gravity: Introducing gravitational plasmas

Moretti,

Bombacigno,

Montani

2021

Preprint

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We discuss some general and relevant features of longitudinal gravitational modes in Horndeski gravity and their interaction with matter media. Adopting a gauge-invariant formulation we clarify how massive scalar and vector fields can induce additional transverse and longitudinal excitations, resulting in breathing, vector and longitudinal polarizations. We review, then, the interaction of standard gravitational waves with a molecular medium, outlining the emergence of effective massive gravitons, induced by the net quadrupole moment due to the molecule deformation. Finally, we investigate the interaction of the massive mode in Horndeski gravity with a noncollisional medium, showing that Landau damping phenomenon can occur in the gravitational sector as well. That allows us to introduce the concept of "gravitational plasma", where inertial forces associated to the background field play the role of cold ions in electromagnetic plasma.

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“…Wave may be dissipated and dispersed by medium, and GW makes no exception Baym et al (2017). Not only viscous medium, but dust may damp the intensity of GW by scattering Svítek (2009). Next we discuss the damping of GW in viscous medium.…”

Section: Damping Of Gw In Viscous Fluidmentioning

confidence: 99%

The effect of redshift degeneracy and the damping effect of viscous medium on the information extracted from gravitational wave signals

Ning

2020

Monthly Notices of the Royal Astronomical Society

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Considering the cosmological redshift zc, the mass of GW source extracted from GW signal is 1 + zc times larger than its intrinsic value, and distance between detector and GW source should be regarded as luminosity distance. However, besides cosmological redshift, there are other kinds of redshifts should be considered, which is actually ignored, in the analysis of GW data, such as Doppler redshift and gravitational redshift, so the parameters extracted from GW may deviate from their intrinsic values. Another factor that may affect GW is the viscous medium in propagation path of GW, which may damp the GW with a damping rate of 16πGη. Some studies indicate dark matter may interact with each other, thus dark matter may be the origin of viscosity of cosmic medium. Then the GW may be rapidly damped by the viscous medium that is made of dark matter, such as dark matter ”mini-spike” around intermediate mass black hole. In this article, we mainly discuss how Doppler and gravitational redshift, together with the damping effect of viscous medium, affect the informations , such as the mass and redshift of GW source, extracted from GW signals.

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The damping of gravitational waves in dust

Cited by 5 publications

References 10 publications

Dispersion of gravitational waves in cold spherical interstellar medium

Dispersion of gravitational waves in cold spherical interstellar medium

The role of longitudinal polarizations in Horndeski and macroscopic gravity: Introducing gravitational plasmas

The effect of redshift degeneracy and the damping effect of viscous medium on the information extracted from gravitational wave signals

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