Electric-magnetic asymmetry of the A^2 condensate and the phases of Yang-Mills theory

Details Electric-magnetic asymmetry of the A^2 condensate and the phases of Yang-Mills theory Electric-magnetic asymmetry of the A^2 condensate and the phases of Yang-Mills theory

2008-05-23

arxiv.org/abs/0805.3714v2

Phys.Rev.D78:034036,2008

Physics

High Energy Physics

High Energy Physics - Lattice

13 pages, 5 figures, RevTeX 4.0; revision: minor changes, references added, published version

Scientific paper

10.1103/PhysRevD.78.034036

We study the finite-temperature behavior of the A^2 condensate in the Landau gauge of SU(2) Yang--Mills theory on the lattice in a wide range of temperatures. The asymmetry between the electric (temporal) and magnetic (spatial) components of this unconventional dimension-2 condensate is a convenient ultraviolet-finite quantity which possesses, as we demonstrate, unexpected properties. The low-temperature behavior of the condensate asymmetry suggests that the mass of the lowest thermal excitation in the condensate is unexpectedly low, about 200 MeV, which is much smaller than the glueball mass. The asymmetry is peaking at the phase transition, becoming a monotonically decreasing function in the deconfinement phase. A symmetric point is reached in the deconfinement phase at a temperature approximately equal twice the critical temperature. The behavior of the electric-magnetic asymmetry of the condensate separates the phase diagram of Yang-Mills theory into three regions. We suggest that these regions are associated with the condensed, liquid and gaseous states of the confining gluonic objects, the Abelian monopoles.

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