Talk presented by Ion Olimpiu Stamatescu

Parallel Session: Topology III

Thursday July 1st, 15.30 - 15.50, Room 6

Authors: M. Garcia-Perez, O. Philipsen, I-O. Stamatescu, and the QCD-TARO Collaboration

Cooling, physical scales and the vacuum structure of Yang-Mills theories.

Abstract: We present a cooling method controlled by a physical {\it cooling radius} that defines a scale below which fluctuations are smoothed out while leaving physics unchanged at all larger scales. We apply this method to study topological properties of lattice gauge theories. We find that the method provides a means to prevent instanton--anti-instanton annihilation under cooling and therefore permits more detailed studies of the instanton ensemble. We present lattice Monte Carlo results concerning the structure of the vacuum of Yang-Mills theories at zero and non-zero temperature.

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