ar X iv : h ep - t h / 01 09 18 5 v 3 2 0 N ov 2 00 1 Once again : Instanton method vs . WKB

ar X iv : h ep - t h / 01 09 18 5 v 2 9 N ov 2 00 1 Once again : Instanton method vs . WKB

A recent analytic test of the instanton method performed by comparing the exact spectrum of the Lamé potential (derived from representations of a finite dimensional matrix expressed in terms of su(2) generators) with the results of the tight–binding and instanton approximations as well as the standard WKB approximation is commented upon. It is pointed out that in the case of the Lamé potential ...

ar X iv : h ep - t h / 01 09 18 5 v 1 2 4 Se p 20 01 Once again : Instanton method vs . WKB

A recent renewed claim that the instanton method and the WKB method do not lead to identical results in the 1–loop approximation is repudiated. It is pointed out that the WKB method, or its equivalent, yields the instanton result provided the boundary conditions are imposed on wave functions which are properly matched in domains of overlap.

ar X iv : h ep - l at / 0 01 10 26 v 2 1 3 N ov 2 00 0 1 QCD vacuum structure

Several issues related to the structure of the QCD vacuum are reviewed. We concentrate mostly on results concerning instantons and center vortices.

ar X iv : h ep - t h / 01 03 09 3 v 1 1 3 M ar 2 00 1 Physical Aspects of the Space - Time Torsion

ar X iv : h ep - l at / 0 01 10 26 v 1 3 N ov 2 00 0 1 QCD vacuum structure

Several issues related to the structure of the QCD vacuum are reviewed. We concentrate mostly on results concerning instantons and center vortices.