Quilis, Vicent; González-García, A. César; Sáez, Diego; Font, José A.
Bibliographical reference
Physical Review D, vol. 75, Issue 10, id. 104008
Advertised on:
5
2007
Journal
Citations
3
Refereed citations
3
Description
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 10-16Hz, 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.