Critical dynamics near QCD critical point

Physics – High Energy Physics – High Energy Physics - Phenomenology

Scientific paper

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

Ph.D. thesis. Figures on the last pages are removed

Scientific paper

In this thesis, we study the critical dynamics near the QCD critical point. Near the critical point, the relevant modes for the critical dynamics are identified as the hydrodynamic modes. Thus, we first study the linear dynamics of them by the relativistic hydrodynamics. We show that the thermal diffusion mode is the most relevant mode, whereas the sound mode is suppressed around the critical point. We also find that the Landau equation, which is believed to be an acausal hydrodynamic equation, has no problem to describe slowly varying fluctuations. Moreover, we find that the Israel-Stewart equation, which is a causal one, gives the same result as the Landau equation gives in the long-wavelength region. Next, we study the nonlinear dynamics of the hydrodynamic modes by the nonlinear Langevin equation and the dynamic renormalization group (RG). In the vicinity of the critical point, the usual hydrodynamics breaks down by large fluctuations. Thus, we must consider the nonlinear Langevin equation. We construct the nonlinear Langevin equation based on the generalized Langevin theory. After the construction, we apply the dynamic RG to the Langevin equation and derive the RG equation for the transport coefficients. We find that the resulting RG equation turns out to be the same as that for the liquid-gas critical point except for an insignificant constant. Consequently, the bulk viscosity and the thermal conductivity strongly diverge at the critical point. Then, a system near the critical point can not be described as a perfect fluid by their strong divergences. We also show that the thermal and viscous diffusion modes exhibit critical-slowing down with the dynamic critical exponents z_{thermal} \sim 3 and z_{viscous} \sim 2, respectively. In contrast, the sound mode shows critical-speeding up with the negative exponent z_{sound} \sim -0.8.

No associations

LandOfFree

Say what you really think

Search LandOfFree.com for scientists and scientific papers. Rate them and share your experience with other people.

Rating

Critical dynamics near QCD critical point does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Critical dynamics near QCD critical point, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Critical dynamics near QCD critical point will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFWR-SCP-O-56357

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.