Mass inflation in a D dimensional Reissner-Nordstrom black hole: a hierarchy of particle accelerators ?

TL;DR

This paper investigates mass inflation inside higher-dimensional Reissner-Nordstrom black holes, showing it occurs similarly to four dimensions and exploring its implications through analytical and numerical methods.

Contribution

It extends the understanding of mass inflation to D-dimensional black holes and combines analytical and numerical approaches to analyze the interior dynamics.

Findings

Mass inflation occurs in D>4 dimensions.

Higher spatial dimensions lead to steeper metric variations.

Numerical simulations confirm the homogeneous approximation results.

Abstract

We study the geometry inside the event horizon of perturbed D dimensional Reissner-Nordstrom-(A)dS type black holes showing that, similarly to the four dimensional case, mass inflation also occurs for D>4. First, using the homogeneous approximation, we show that an increase of the number of spatial dimensions contributes to a steeper variation of the metric coefficients with the areal radius and that the phenomenon is insensitive to the cosmological constant in leading order. Then, using the code reported in arXiv:0904.2669 [gr-qc] adapted to D dimensions, we perform fully non-linear numerical simulations. We perturb the black hole with a compact pulse adapting the pulse amplitude such that the relative variation of the black hole mass is the same in all dimensions, and determine how the black hole interior evolves under the perturbation. We qualitatively confirm that the phenomenon is similar to four dimensions as well as the behaviour observed in the homogeneous approximation. We speculate about the formation of black holes inside black holes triggered by mass inflation, and about possible consequences of this scenario.