Thursday, November 5, 2009, 12:30 pm — Physics Dept., Room 2-160
It is widely believed that at sufficiently high temperatures or densities, protons and neutrons dissolve into a gas of their constituents, a quark gluon plasma. However, the deconfining phase transition does not pass directly to a gas which can be described as non-interacting particles, but traverses a strongly coupled region, where perturbative methods fail. Also, the usual three dimensional effective theory, EQCD, cannot account for the fluctuations between distinct Z(N) vacua above the phase transition, because EQCD breaks the Z(N) center-symmetry explicitly. As a model for the strongly coupled quark gluon plasma (SQGP), we study an effective theory of SU(2) Wilson Lines, which is constructed in such a way that it respects all of the symmetries of four-dimensional SU(2) pure gauge theory. In this picture, the QGP is a condensate of flux tubes, rather than a gas. Lattice simulations are performed, to investigate whether a "fuzzy bag" term, which is added to the Lagrangian by hand, can induce eigenvalue repulsion and therefore generate non-perturbative fluctuations.
Hosted by: Robert Pisarski
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