Instantons from over-improved cooling

Details Instantons from over-improved cooling Instantons from over-improved cooling

1993-09-16

arxiv.org/abs/hep-lat/9309009v2

Nucl.Phys.B413:535-552,1994

Physics

High Energy Physics

High Energy Physics - Lattice

15p, 3 figs appended in PostScript (uudecoded), preprint INLO-PUB-11/93, FTUAM-93/31. Correction of eq.(16) and the discussion

Scientific paper

10.1016/0550-3213(94)90631-9

Lattice artefacts are used, through modified lattice actions, as a tool to find the largest instantons in a toroidal geometry [0,L]^3X[0,T] for T to infinity. It is conjectured that the largest instanton is associated with tunnelling through a sphaleron. Existence of instantons with at least 8 parameters can be proven with the help of twisted boundary conditions in the time direction. Numerical results for SU(2) gauge theory obtained by cooling are presented to demonstrate the viability of the method.

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