1998/10/06 by Dietrich Bodeker, Bodeker, Dietrich
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #hep-ph
paper · pdf · doi:10.48550/arxiv.hep-ph/9810265
10 pages, revtex, Talk presented at the 5th International Workshop on Thermal Field Theories and their Applications, Regensburg, Germany, August 1998
arxiv created 1998/10/06 · arxiv updated 2009/11/30
I try to explain some recent progress in understanding the non-perturbative dynamics of hot non-Abelian gauge theories. The non-perturbative physics is due to soft spatial momenta |p|∼ g2 T where g is the gauge coupling and T is the temperature. An effective theory for the soft field modes is obtained by integrating out the field modes with momenta of order T and of order g T in a leading logarithmic approximation. In this effective theory the time evolution of the soft fields is determined by a local Langevin-type equation. This effective theory determines the parametric form of the rate for hot electroweak baryon number violation as Γ= κg10 log(1/g) T4. The non-perturbative coefficient κ is independent of the gauge coupling and it can be computed by solving the effective equations of motion on a lattice.