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Wednesday, October 28th 2009

1:25 pm:

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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