Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1999-11-30
Phys.Rev. D63 (2001) 045021
Physics
High Energy Physics
High Energy Physics - Phenomenology
LaTex, 49 pages, 15 .ps figures
Scientific paper
10.1103/PhysRevD.63.045021
The dynamics of a dense relativistic quantum fluid out of thermodynamic equilibrium is studied in the framework of the Phi^4 scalar field theory in the large N limit. The time evolution of a particle distribution in momentum space (the tsunami) is computed. The effective mass felt by the particles in such a high density medium equals the tree level mass plus the expectation value of the squared field. The case of negative tree level squared mass is particularly interesting. In such case dynamical symmetry restoration as well as dynamical symmetry breaking can happen. Furthermore, the symmetry may stay broken with vanishing asymptotic squared mass showing the presence of out of equilibrium Goldstone bosons. We study these phenomena and identify the set of initial conditions that lead to each case. We compute the equation of state which turns to depend on the initial state. Although the system does not thermalize, the equation of state for asymptotically broken symmetry is of radiation type. We compute the correlation functions at equal times. The two point correlator for late times is the sum of different terms. One stems from the initial particle distribution. Another term accounts for the out of equilibrium Goldstone bosons created by spinodal unstabilities when the symmetry is asymptotically broken.Both terms are of the order of the inverse of the coupling for distances where causal signals can connect the two points. The contribution of the out of equilibrium Goldstones exhibits scaling behaviour in a generalized sense.
Cao Francisco J.
de Vega Hector J.
No associations
LandOfFree
Non-equilibrium dynamics in quantum field theory at high density: the tsunami 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 Non-equilibrium dynamics in quantum field theory at high density: the tsunami, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Non-equilibrium dynamics in quantum field theory at high density: the tsunami will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-295453