University of Minnesota
School of Physics & Astronomy

Nuclear Physics Seminar

Wednesday, October 28th 2009
1:25 pm:
Nuclear Physics Seminar in 435 Physics
Speaker: Zohreh Davoudi, University of Minnesota
Subject: The effect of second order dissipation on the sound velocity in the QCD plasma using the effective potential of the linear sigma model

The heavy ion collision experiments are in progress in order to
investigate how the Universe has evolved after the Big Bang. The recent
observations show that a nearly perfect fluid is produced after heavy
ion collisions. An appropriate incorporation of the relativistic
hydrodynamics and the field theory would help us to describe the
dynamics of QCD (Quantum Chromodynamics) matter under extreme
conditions, and to survey the expected phase transitions. Some efforts
to investigate the characteristics of the QCD plasma are devoted to an
ideal, non-dissipative one. To get the results which are highly in
accordance with the experiment, it is necessary to bring also in mind
the role of dissipation, particularly the second order dissipation,
because the first order dissipation will result in instabilities and
causality violation. We are to couple the field theory and the
hydrodynamics of the dissipative fluid in such a way that the effect of
second order dissipative coefficients in addition to the effect of the
fields will emerge in the properties of the quark-gluon plasma (QGP)
such as sound velocity. In this seminar, after deriving the
thermodynamical potential using the effective potential of the linear
sigma model, we will study the effect of second order dissipation on the
sound velocity in the QGP and its variation near the chiral phase
transition.

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