  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.

General Relativity and Quantum Cosmology