4.3 GW emission mechanisms
If the collapsed remnant is a black hole, GWs will be radiated as the infall of the remaining stellar
matter distorts the black hole’s geometry. This “ringdown phase” will end when gravitational radiation has
dissipated all of the black hole’s accretion-induced distortion. Zanotti, Rezzolla, and Font [269
]
have suggested that the torus of matter surrounding the black hole may be an even stronger
source of GWs than the collapse itself (see also [140, 141, 251
, 250]). Kobayashi & Mészáros
(2003) have further found that the GW signal will be polarized and this polarization may be
detectable.