MG13 - Talk detail

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Abstract

The motion of a massive test particle inside a thermal photon gas is studied near a Schwarzschild black hole, leading to a novel description of the effect of radiation scattering of the particle trajectories, which we refer to as the "second half" of the Poynting-Robertson effect. Based on a statistical description of the test photon gas, it is found that a particle moving in the gravitational background of a Schwarzschild black hole always ends up within the black hole horizon. An analogue study is presented in the case of the Tolman metric which describes a spherically symmetric distribution of photons, but now not considered as a test field. This second part of the analysis enables us to quantify the importance of the curvature generated by the photons with respect to the scattering process suggesting that the asymptotic motion of the massive particle in the approximate and in the exact computations is the same.

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