Effect of quantum fluctuations on the shape of an instanton
Migdal A. B., Agasyan N. O., Khokhlachev S. B.
Quantum effects strongly influence the shape of an instanton. In particular, for an instanton with a dimension small in comparison with the confinement radius the power-law asymptotic behavior of the classical solution at large distances from the center of the instanton is replaced by a Gaussian decay of the profile function.