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Effective dynamics of soft non-abelian gauge fields at finite temperature
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abstract
We consider time dependent correlation functions of non-abelian gauge fields at finite temperature. An effective theory for the soft ($p\sim g^2 T$) field modes is derived 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. As an application, the rate for hot electroweak baryon number violation is estimated as $\Gamma \sim g^2 \log(1/g) (g^2 T)^4$. Furthermore, possible consequences for non-perturbative lattice computations of unequal time correlation functions are discussed.
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