Nonthermal fixed points and the functional renormalization group
arXiv:0809.5208 · doi:10.1016/j.nuclphysb.2008.12.017
Abstract
Nonthermal fixed points represent basic properties of quantum field theories, in addition to vacuum or thermal equilibrium fixed points. The functional renormalization group on a closed real-time path provides a common framework for their description. For the example of an O(N) symmetric scalar theory it reveals a hierarchy of fixed point solutions, with increasing complexity from vacuum and thermal equilibrium to nonequilibrium.
32 pages, Nucl. Phys. B version (minor changes of wordings)