Answers are grounded in this paper and cite their sources.
Traversible wormhole space-times are found as static, spherically symmetric solutions to the Einstein equations with ingoing and outgoing pure radiation of negative energy density. Switching off the radiation causes the wormhole to collapse to a Schwarzschild black hole.
No takes yet. Share an insight, caveat, or question.
Sean A. Hayward (2002) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: