Bödeker's Effective Theory: From Langevin Dynamics to Dyson-Schwinger Equations

The dynamics of weakly coupled, non-abelian gauge fields at high temperature is non-perturbative if the characteristic momentum scale is of order |k| \sim g^2 T. Such a situation is typical for the processes of electroweak baryon number violation in the early Universe. Bödeker has derived an effective theory that describes the dynamics of the soft field modes to leading logarithmic order by means of a Langevin equation. This effective theory has been used for lattice calculations so far. In this work we provide a complementary, more analytic approach based on Dyson-Schwinger equations. Using methods known from stochastic quantisation, we recast Bödeker's Langevin equation in the form of a field theoretic path integral. We argue that a physically reasonable truncation of the Dyson-Schwinger equations requires the introduction of gauge ghosts, which in general is not mandatory in stochastic quantisation. This leads to a BRST symmetric formulation and to corresponding Ward-Takahashi identities. A second BRST symmetry reflecting the origin in a stochastic differential equation has to be sacrificed to establish the gauge BRST symmetry. The (stochastic) Ward identities can still be obtained by referring to the underlying structure and are shown to produce a cancellation among several terms of the gauge Ward identity. To clarify some issues, we derive the Feynman rules and perform some perturbative calculations. Finally, we deduce the Dyson-Schwinger equations and suggest a truncation scheme that approximately respects the gauge and stochastic Ward identities.

Level thesis:degree_level

thesis.doctoral

Grantor dc:publisher

Universität Heidelberg

Year

2004

Author dc:creator

• Zahlten, Claus

Contributors dc:contributor

• Schmidt, Michael G.

Repository record source_url

http://www.ub.uni-heidelberg.de/archiv/4437

OAI identifier oai:identifier

oai:archiv.ub.uni-heidelberg.de:4437