TL;DR
This paper investigates the quantum vacuum effects on wormhole stability by calculating electromagnetic stress-energy tensor expectations, suggesting that vacuum fluctuations could support the existence of wormholes in empty space.
Contribution
It provides a detailed calculation of vacuum stress-energy in wormhole geometries, showing that quantum effects can violate energy conditions necessary for wormhole stability.
Findings
Weak energy condition is violated at the wormhole throat.
Vacuum fluctuations can support wormholes without exotic matter.
Geometry close to an infinitely long wormhole favors stability.
Abstract
Renormalized vacuum expectation values of electromagnetic stress-energy tensor are calculated in the background spherically-symmetrical metric of the wormhole's topology. Covariant geodesic point separation method of regularization is used. Violation of the weak energy condition at the throat of wormhole takes place for geometry sufficiently close to that of infinitely long wormhole of constant radius irrespectively of the detailed form of metric. This is an argument in favour of possibility of existence of selfconsistent wormhole in empty space maintained by vacuum field fluctuations in the wormhole's background.
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