Abstract:
Effective Lagrangian of the vacuum polarisation is expressed in terms of spectral
density of eigen-values of the wave equation and five-dimensional Green function introduced
by V. A. Fock in his method of the 5-th coordinate. Method can be applied
for external fields of arbitrary strength but only if the interaction of vacuum fields
is neglected. The calculations for the case of vacuum polarisation by gravitational and
electromagnetic fields are performed.
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