Construction and enlargement of traversable wormholes from Schwarzschild black holes

TL;DR

This paper presents analytic solutions for constructing and enlarging traversable wormholes from Schwarzschild black holes within Einstein gravity, utilizing pure radiation with negative energy density and impulsive null shells.

Contribution

It introduces explicit analytic models for creating and expanding traversable wormholes from black holes using phantom radiation and impulsive null shells, advancing theoretical understanding.

Findings

Analytic solutions for wormhole construction from Schwarzschild black holes.

Methods for enlarging traversable wormholes using impulsive radiation.

Use of negative energy density matter models in wormhole physics.

Abstract

Analytic solutions are presented which describe the construction of a traversable wormhole from a Schwarzschild black hole, and the enlargement of such a wormhole, in Einstein gravity. The matter model is pure radiation which may have negative energy density (phantom or ghost radiation) and the idealization of impulsive radiation (infinitesimally thin null shells) is employed.