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.

6 pages, 1 figure

References in corpus (5)

• Collision of two general geodesic particles around a Kerr black hole
• Do active galactic nuclei convert dark matter into visible particles?
• On the energy of particle collisions in the ergosphere of the rotating black holes
• Unbound geodesics from the ergosphere and potential observability of debris from ultrahigh energy particle collisions
• On collisions with unlimited energies in the vicinity of Kerr and Schwarzschild black hole horizons

Cited by in corpus (3)

• Maximum efficiency of the collisional Penrose process
• The Orbital Lense-Thirring Precession in a Strong Field
• Properties of particles in the ergosphere of black holes