Abstract
Department of Physics and Astronomy, Dartmouth College, Hanover, NH 03755, USA(DART-HEP-98/03 February 5, 2008)The breaking of an approximate discrete symmetry, thefinal stages of a first order phase transition, or a post-inflationary biased probability distribution for scalar fields arepossible cosmological scenarios characterized by the presenceof unstable domain wall networks. Combining analytical andnumerical techniques, we show that the non-spherical collapseof these domains can be a powerful source of gravitationalwaves. We compute their contribution to the stochastic back-ground of gravitational radiation and explore their observabil-ity by present and future gravitational wave detectors.04.30.Db, 98.80.Cq
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