Resummation in hot field theories

Abstract

We consider a scalar theory at finite temperature in the 2PI resummation scheme, including phi^3 and phi^4 interactions. Already at the one loop level in this scheme, we have to deal with a non local approximation. We carry out the renormalization and obtain finite equations for the propagator. Within this model we can explore the effect of non local contributions to the self-energy in the evaluation of thermodynamic quantities.

Comments: 5 pages, 3 figures, contribution to the conference Strong and Electroweak Matter (SEWM2002), Heidelberg, Germany, October 2-5, 2002