Gravitational Waves from Galaxy Clusters: A New Observable Effect

Quilis, Vicent; Ibáñez, Javier; Sáez, D.

doi:10.1086/311446

Cited by 11 publications

(28 citation statements)

References 13 publications

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“…2, is consistent with previous works in this field [62,63]. Moreover it is comparable to analytic approximations (e.g.…”

Section: Resultssupporting

confidence: 92%

“…This excludes, therefore, any direct detection of a complete pulse, but still allows for the possibility of GW detection via secondary CMB anisotropy and polarization and via the ''secular effect'' discussed in Refs. [62,63]. The latter takes place when a gravitational-wave crosses two testing particles; this induces a variation in their relative distance which increases in time, since this effect lasts for many years.…”

Section: Resultsmentioning

confidence: 99%

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Stochastic gravitational wave background from cold dark matter halos

2006

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The current knowledge of cosmological structure formation suggests that Cold Dark Matter (CDM) halos possess a nonspherical density profile, implying that cosmic structures can be potential sources of gravitational waves via power transfer from scalar perturbations to tensor metric modes in the nonlinear regime. By means of a previously developed mathematical formalism and a triaxial collapse model, we numerically estimate the stochastic gravitational-wave background generated by CDM halos during the fully nonlinear stage of their evolution. Our results suggest that the energy density associated with this background is comparable to that produced by primordial tensor modes at frequencies 10 ÿ18 -10 ÿ17 Hz if the energy scale of inflation is V 1=4 1-2 10 15 GeV, and that these gravitational waves could give rise to several cosmological effects, including secondary CMB anisotropy and polarization.

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“…2, is consistent with previous works in this field [62,63]. Moreover it is comparable to analytic approximations (e.g.…”

Section: Resultssupporting

confidence: 92%

Section: Resultsmentioning

confidence: 99%

Stochastic gravitational wave background from cold dark matter halos

2006

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“…The results reported in this work are similar to those investigated by [7,33] regarding the nonlinear evolution of cosmological structures as sources of gravitational radiation. Future work on this topic should account for the integrated effect of a realistic galaxy distribution.…”

Section: Discussionsupporting

confidence: 88%

Gravitational waves from galaxy encounters

et al. 2007

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We discuss the emission of gravitational radiation produced in encounters of dark matter galactic halos. To this aim we perform a number of numerical simulations of typical galaxy mergers, computing the associated gravitational radiation waveforms as well as the energy released in the processes. Our simulations yield dimensionless gravitational wave amplitudes of the order of 10 ÿ13 and gravitational wave frequencies of the order of 10 ÿ16 Hz, when the galaxies are located at a distance of 10 Mpc. These values are of the same order as those arising in the gravitational radiation originated by strong variations of the gravitational field in the early Universe, and therefore, such gravitational waves cannot be directly observed by ground-based detectors. We discuss the feasibility of an indirect detection by means of the B-mode polarization of the cosmic microwave background (CMB) induced by such waves. Our results show that the gravitational waves from encounters of dark matter galactic halos leave much too small an imprint on the CMB polarization to be actually observed with ongoing and future missions.

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“…Finally, it should be stressed that our new set of equations has many possible cosmological applications such as, for example, the evaluation of the stochastic gravitational-wave backgrounds produced by CDM halos [27][28][29] and substructures within halos. It can be also used to improve the estimate of gravitational lensing effects and gravityinduced secondary CMB temperature/polarization anisotropies generated by small-scale structures [7][8][9].…”

Section: Discussionmentioning

confidence: 99%

Unified treatment of cosmological perturbations from superhorizon to small scales

2005

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We study the evolution of cosmological perturbations, using a hybrid approximation scheme which upgrades the weak-field limit of Einstein's field equations to account for post-Newtonian scalar and vector metric perturbations and for leading-order source terms of gravitational waves, while including also the first and second-order perturbative approximations. Our equations, which are derived in the Poisson gauge, provide a unified description of matter inhomogeneities in a Universe filled with a pressureless and irrotational fluid and a cosmological constant, ranging from the linear to the highly non-linear regime. The derived expressions for scalar, vector and tensor modes may have a wide range of cosmological applications, including secondary CMB anisotropy and polarization effects, cosmographic relations in a inhomogeneous Universe, gravitational lensing and the stochastic gravitational-wave backgrounds generated by non-linear cosmic structures.

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Gravitational Waves from Galaxy Clusters: A New Observable Effect

Cited by 11 publications

References 13 publications

Stochastic gravitational wave background from cold dark matter halos

Stochastic gravitational wave background from cold dark matter halos

Gravitational waves from galaxy encounters

Unified treatment of cosmological perturbations from superhorizon to small scales

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