Eur. Phys. J. A (2007) 31: 754-757
https://doi.org/10.1140/epja/i2007-10008-4

QNP 2006

Finite-temperature φ ⁴ theory from the 2PI effective action: Two-loop truncation

¹ NIKHEF, Kruislaan 409, 1098 SJ, Amsterdam, The Netherlands
² Institut für Theoretische Physik, Universität Heidelberg, Philosophenweg 16, 69120, Heidelberg, Germany

^* e-mail: arrizaba@nikhef.nl

Received: 8 January 2007
Accepted: 15 January 2007
Published online: 28 March 2007

Abstract

Using resummation techniques based on the 2PI effective action we study the scalar φ ⁴ theory at finite temperature. We present an analytical as well as numerical study for a renormalized two-loop truncation of the action. Both the spectral properties and critical behaviour of the theory are investigated. Within the truncation, we explicitly check that the physical observables are UV-finite.