Evolving wormholes and the weak energy condition

Nonstatic Lorentzian wormholes conformally related to static wormhole geometries are found to exist for a finite (arbitrarily large) or half-infinite ($b<t\ensuremath{\le}\ensuremath{\infty}$) interval of time, with the required energy-momentum tensor satisfying the weak energy condition. Features of such spacetimes are discussed, along with several examples.

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