Universality of high-energy absorption cross sections for black holes

@article{Decanini2011UniversalityOH,
  title={Universality of high-energy absorption cross sections for black holes},
  author={Yves D'ecanini and Gilles Esposito-Far{\`e}se and Antoine Folacci},
  journal={Physical Review D},
  year={2011},
  volume={83},
  pages={044032}
}
We consider the absorption problem for a massless scalar field propagating in static and spherically symmetric black holes of arbitrary dimension endowed with a photon sphere. For this wide class of black holes, we show that the fluctuations of the high energy absorption cross section are totally and very simply described from the properties (dispersion relation and damping) of the waves trapped near the photon sphere and therefore, in the eikonal regime, from the characteristics (orbital… 

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