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High Energy Physics Seminars
High Energy
Thursday, November 15, 2012
2:30 PM
Physics Building, Room 313
Note special date.
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Note special room.

Thomas Schaefer
[Host: Diana Vaman]
North Carolina State University
"Continuity of the Deconfinement Transition in (Super) Yang Mills Theory"
Slideshow (PDF)

ABSTRACT:
Finding controlled, analytical approaches to the deconfinement transition in QCD is an old problem. Here we present a weak coupling calculation of the deconfinement transition in a deformed version of QCD. We argue that this transition is continuously connected to the transition in pure gauge theory, which takes place in strong coupling.
More technical abstract: We study the phase diagram of SU(2) YangMills theory with one adjoint Weyl fermion on R^3xS^1 as a function of the fermion mass m and the compactification scale beta. This theory reduces to thermal pure gauge theory as m>infinity and to circlecompactified
(twisted) susy gluodynamics in the limit m>0. In the mL plane, there is a line of center symmetry changing phase transitions. In the limit
m>infinity, this transition takes place at beta_c=1/T_c, where T_c is
the critical temperature of the deconfinement transition in pure YangMills theory. We show that near m=0, the critical scale beta_c can be computed using semiclassical methods and that the transition is of second order.
This suggests that the deconfining phase transition in pure YangMills theory is continuously connected to a phase transition that can be studied in weak coupling. The center symmetry changing phase transition arises from the competition of fractionally charged instantonmonopoles and instanton molecules. The calculation can be extended to higher rank gauge groups and nonzero theta angle. 
SLIDESHOW:




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