Weyl-Invariant Lightlike Branes and Soldering of Black Hole Space-Times

TL;DR

This paper introduces Weyl-invariant lightlike branes that couple to Einstein-Maxwell fields, producing solutions with two different black hole geometries separated by the brane, which acts as a horizon trap and modifies the cosmological constant.

Contribution

It presents a new class of Weyl-invariant lightlike branes and their role in creating composite black hole solutions with distinct geometries separated by the brane.

Findings

Solutions with two different black hole geometries separated by the brane

The brane acts as a potential well trapping test particles

Dynamically generated cosmological constants in different regions

Abstract

We consider self-consistent coupling of the recently introduced new class of Weyl-conformally invariant lightlike branes (WILL-branes) to D=4 Einstein-Maxwell system plus a D=4 three-index antisymmetric tensor gauge field. We find static spherically-symmetric solutions where the space-time consists of two regions with different black-hole-type geometries and different values for a dynamically generated cosmological constant, separated by the WILL-brane which ``straddles'' their common event horizon. Furthermore, the WILL-brane produces a potential ``well'' around itself acting as a trap for test particles falling towards the horizon.