2 research outputs found
Dynamic critical phenomena from spectral functions on the lattice
We investigate spectral functions in the vicinity of the critical temperature
of a second-order phase transition. Since critical phenomena in quantum field
theories are governed by classical dynamics, universal properties can be
computed using real-time lattice simulations. For the example of a relativistic
single-component scalar field theory in 2+1 dimensions, we compute the spectral
function described by universal scaling functions and extract the dynamic
critical exponent z. Together with exactly known static properties of this
theory, we obtain a verification from first principles that the relativistic
theory is well described by the dynamic universality class of relaxational
models with conserved density (Model C).Comment: 18 pages, 6 figures, NPB version, minor change
EMMI Rapid Reaction Task Force on "Thermalization in Non-abelian Plasmas"
Recently, different proposals have been put forward on how thermalization
proceeds in heavy-ion collisions in the idealized limit of very large nuclei at
sufficiently high energy. Important aspects of the parametric estimates at weak
coupling may be tested using well-established classical-statistical lattice
simulations of the far-from-equilibrium gluon dynamics. This has to be
confronted with strong coupling scenarios in related theories based on
gauge-string dualities. Furthermore, closely related questions about
far-from-equilibrium dynamics arise in early-universe cosmology and in
non-relativistic systems of ultracold atoms. These were central topics of the
EMMI Rapid Reaction Task Force meeting held on December 12-14, 2011, at the
University of Heidelberg, which we report on.Comment: 13 pages, summary of the EMMI Rapid Reaction Task Force on
"Thermalization in Non-abelian Plasmas", December 12-14, 2011, University of
Heidelberg, German