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Gravitational waves from galaxy encounters

AuthorsQuilis, Vicente; González-García, A. César ; Sáez, Diego; Font, José A.
Instituto de Ciencias del Patrimonio
Institute of Heritage Sciences
galaxy encounters
gravitational waves
Issue Date2007
PublisherAmerican Physical Society
CitationPhysical Review D 75 (10): 104008
Abstract[EN]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^-13 and gravitational wave frequencies of the order of 10^-16 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.
Publisher version (URL)http://link.aps.org/doi/10.1103/PhysRevD.75.104008
Appears in Collections:(INCIPIT) Artículos
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