Construction and enlargement of traversable wormholes from Schwarzschild black holes
Hiroko Koyama, Sean A. Hayward
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.
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