Wave propagation and quasinormal mode excitation on Schwarzschild spacetime
Wave propagation and quasinormal mode excitation on Schwarzschild spacetime
To seek a deeper understanding of wave propagation on the Schwarzschild spacetime, we investigate the relationship between (i) the lightcone of an event and its caustics (self-intersections), (ii) the large-$l$ asymptotics of quasinormal (QN) modes, and (iii) the singular structure of the retarded Green function (GF) for the scalar field. …