References & Citations
High Energy Physics - Theory
Title: Absorptive Effects and Classical Black Hole Scattering
(Submitted on 29 Sep 2023 (v1), last revised 3 Mar 2024 (this version, v2))
Abstract: We describe an approach to incorporating the physical effects of the absorption of energy by the event horizon of black holes in the scattering amplitudes based post-Minkowskian, point-particle effective description. Absorptive dynamics are incorporated in a model-independent way by coupling the usual point-particle description to an invisible sector of gapless internal degrees-of-freedom. The leading order dynamics of this sector are encoded in the low-energy expansion of a spectral density function obtained by matching an absorption cross section in the ultraviolet description. This information is then recycled using the scattering amplitudes based Kosower-Maybee-O'Connell in-in formalism to calculate the leading absorptive contribution to the impulse and change in rest mass of a Schwarzschild black hole scattering with a second compact body sourcing a massless scalar, electromagnetic or gravitational field. The results obtained are in complete agreement with previous worldline Schwinger-Keldysh calculations and provide an alternative on-shell scattering amplitudes approach to incorporating horizon absorption effects in the gravitational two-body problem.
Submission history
From: Callum Jones [view email][v1] Fri, 29 Sep 2023 18:19:44 GMT (49kb,D)
[v2] Sun, 3 Mar 2024 19:36:46 GMT (49kb,D)
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