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Can Quantum Particles Cross a Horizon?

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Abstract

The prevalent opinion that infalling objects can freely cross a black hole horizon is based on the assumptions that the horizon region is governed by classical General Relativity and by specific singular coordinate transformations it is possible to remove divergences in the geodesic equations. However, the coordinate transformations usually used to demonstrate the geodesic completeness are of class C0, while the standard causality theory requires that the metric tensor to be at least C1. Introduction of C0-class functions leads to the appearance of the additional delta-like sources in the Einstein equations and in the equations for quantum particles. Therefore, to explore the horizon region, in addition to the classical geodesic equations, one needs to use equation of quantum particles. Applying physical boundary conditions at the Schwarzschild and Kerr event horizons, we show existence of the exponentially decay/enhanced solutions (with the complex phases) to the Klein-Gordon equation. This means that in semi-classical approximation particles probably do not enter the black hole horizon, but are absorbed/reflected by it. Then it follows that the minimal classical size of any isolated body is its horizon radius, what potentially can solve main black hole mysteries.

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Acknowledgments

This work was supported by Shota Rustaveli National Science Foundation of Georgia (SRNSFG) [DI-18-335/New Theoretical Models for Dark Matter Exploration].

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  1. Javakhishvili Tbilisi State University, 3 Chavchavadze Avenue, Tbilisi, 0179, Georgia

    Merab Gogberashvili

  2. Andronikashvili Institute of Physics, 6 Tamarashvili Street, Tbilisi, 0177, Georgia

    Merab Gogberashvili

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Correspondence to Merab Gogberashvili.

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Gogberashvili, M. Can Quantum Particles Cross a Horizon?. Int J Theor Phys 58, 3711–3725 (2019). https://doi.org/10.1007/s10773-019-04242-0

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