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Angular profile of particle emission from a higher-dimensional black hole: analytic results

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Abstract

During the spin-down phase of the life of a higher-dimensional black hole, the emission of particles on the brane exhibits a strong angular variation with respect to the rotation axis of the black hole. It has been suggested that this angular variation is the observable that could disentangle the dependence of the radiation spectra on the number of extra dimensions and angular momentum of the black hole. Working in the low-energy regime, we have employed analytical formulae for the greybody factors, angular eigenvalues and eigenfunctions of fermions and gauge bosons, and studied the characteristics of the corresponding angular profiles of emission spectra in terms of only a few dominant partial modes. We have confirmed that, in the low-energy channel, the emitted gauge bosons become aligned to the rotation axis of the produced black hole while fermions form an angle with the rotation axis whose exact value depends on the angular-momentum of the black hole. In the case of scalar fields, we demonstrated the existence of a “spherically-symmetric zone” in the low-energy regime that is followed by the concentration of the emission on the equatorial plane as the energy increases, again in total agreement with the exact numerical results.

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  1. Division of Theoretical Physics, Department of Physics, University of Ioannina, Ioannina, GR-451 10, Greece

    Panagiota Kanti & Nikolaos Pappas

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  1. Panagiota Kanti
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Kanti, P., Pappas, N. Angular profile of particle emission from a higher-dimensional black hole: analytic results. J. High Energ. Phys. 2012, 19 (2012). https://doi.org/10.1007/JHEP12(2012)019

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