Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology
Scientific paper
2011-08-25
Physical Review D 84, 084035 (2011)
Astronomy and Astrophysics
Astrophysics
General Relativity and Quantum Cosmology
v2: Minor changes to match the published version. v3: Typos corrected
Scientific paper
10.1103/PhysRevD.84.084035
We reexamine some aspects of scattering by a Schwarzschild black hole in the framework of complex angular momentum techniques. More precisely, we consider, for massive scalar perturbations, the high-energy behavior of the resonance spectrum and of the absorption cross section by emphasizing analytically the role of the mass. This is achieved (i) by deriving asymptotic expansions for the Regge poles of the $S$-matrix and then for the associated weakly damped quasinormal frequencies and (ii) by taking into account the analytic structure of the greybody factors which allows us to extract by resummation the physical information encoded in the absorption cross section.
Décanini Yves
Folacci Antoine
Raffaelli Bernard
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