Lightlike Branes as Natural Candidates for Wormhole Throats
Eduardo Guendelman, Alexander Kaganovich, Emil Nissimov, Svetlana, Pacheva

TL;DR
This paper develops a consistent description of lightlike branes, showing they naturally occupy horizons and can produce traversable wormholes with parameters determined by their dynamical tension.
Contribution
It introduces a dual Lagrangian formulation of lightlike branes and demonstrates their role in forming traversable wormholes in Einstein-Maxwell systems.
Findings
Lightlike branes automatically occupy horizons in symmetric backgrounds.
LL-branes can produce traversable wormholes with tension-dependent parameters.
The tension of LL-branes is a dynamical degree of freedom.
Abstract
We first briefly present a consistent world-volume Lagrangian description of lightlike p-branes (LL-branes) in two equivalent forms - a Polyakov-type and a dual to it Nambu-Goto-type formulations. The most important characteristic features of LL-brane dynamics are: (i) the brane tension appears as a non-trivial additional dynamical degree of freedom; (ii) consistency of LL-brane dynamics in a spherically or axially symmetric gravitational background of codimension one requires the presence of an event horizon which is automatically occupied by the LL-brane ("horizon straddling"). Next we consider a bulk Einstein-Maxwell system interacting self-consistently with a codimension one LL-brane. We find spherically symmetric traversable wormhole solutions of Misner-Wheeler type produced by the LL-brane sitting at the wormhole throat with wormhole parameters being functions of the dynamical…
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