Are black holes totally black?

Abstract

Geodesic completeness needs existence near the horizon of the black hole of "white hole" geodesics coming from the region inside of the horizon. Here we give the classification of all such geodesics with the energies $E/m\le 1$ for the Schwarzschild and Kerr's black hole. The collisions of particles moving along the "white hole" geodesics with those moving along "black hole" geodesics are considered. Formulas for the increase of the energy of collision in the centre of mass frame are obtained and the possibility of observation of high energy particles arriving from the black hole to the Earth is discussed.

arXiv comment6 pages, 1 figure

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• Kinematic censorship as a constraint on allowed scenarios of high energy particle collisions
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• General radially moving references frames in the black hole background
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• On the limiting energy of the collision of elementary particles close to horizon of the rotating black hole
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• Properties of particles in the ergosphere of black holes
• New scenarios of high-energy particle collisions near wormholes
• Dynamics of redshift/blueshift during free fall under the Schwarzschild horizon