2PI functional techniques for abelian gauge theories (2008)
We summarize our recent work [1-3] concerning the formulation of two-particle-irreducible (2PI) functional techniques for abelian gauge field theories.
Ward Identities for the 2PI effective action in QED (2007)
We study the issue of symmetries and associated Ward-like identities in the context of two-particle-irreducible (2PI) functional techniques for abelian gauge theories. In the 2PI framework, the...
2PI renormalized effective action for gauge theories (2006)
We show how to perform renormalization in the framework of the 2PI effective action for abelian gauge theories. In addition to the usual renormalization conditions one needs to incorporate new ones...
Renormalized Finite Temperature phi^4 theory from the 2PI Effective Action (2006)
We present an analytical and numerical study of scalar phi^4 theory at finite temperature with a renormalized 2-loop truncation of the 2PI effective action.
Nonperturbative renormalization for 2PI effective action techniques (2006)
Berges, J., Borsany, S., Reinosa, U., Serreau, J.
Nonperturbative approximation schemes based on two-particle irreducible (2PI) effective actions provide an important means for our current understanding of (non-)equilibrium quantum field theory. A...
We provide a renormalization procedure for Phi-derivable approximations in theories coupling different types of fields. We illustrate our approach on a scalar phi^4 theory coupled to fermions via a...
Nonperturbative renormalization of Phi-derivable approximations in theories with fermions (2005)
We show how to renormalize Phi-derivable approximations in a theory with a fermionic field coupled to a self-interacting scalar field through a Yukawa interaction. The nonperturbative renormalization...
Nonperturbative renormalization for 2PI effective action techniques (2005)
Berges, J., Borsany, S., Reinosa, U., Serreau, J.
Nonperturbative approximation schemes based on two-particle irreducible (2PI) effective actions provide an important means for our current understanding of (non-)equilibrium quantum field theory. A...
Nonperturbative renormalization for 2PI effective action techniques (2005)
Berges, J., Borsany, S., Reinosa, U., Serreau, J.
Nonperturbative approximation schemes based on two-particle irreducible (2PI) effective actions provide an important means for our current understanding of (non-)equilibrium quantum field theory. A...
Renormalized thermodynamics from the 2PI effective action (2004)
Berges, J., Borsanyi, Sz., Reinosa, U., Serreau, J.
High-temperature resummed perturbation theory is plagued by poor convergence properties. The problem appears for theories with bosonic field content such as QCD, QED or scalar theories. We calculate...