Abstract Finite-temperature infinite matter is analyzed with the recently introduced effective-field-theory(EFT)-inspired YGLO (Yang–Grasso–Lacroix–Orsay) and ELYO (extended Lee–Yang, Orsay) functionals, which are designed to describe very low-density regimes in symmetric (YGLO) pure neutron (YGLO ELYO) matter. The article deals aims verify whether use of these functionals allows us correctly i...

We apply the δ-expansion perturbation scheme to the λφ4 self-interacting scalar field theory in 3+1 D at finite temperature. In the δ-expansion the interaction term is written as λ(φ2)1+δ and δ is considered as the perturbation parameter. We compute within this perturbative approach the renormalized mass at finite temperature at a finite order in δ. The results are compared with the usual loop-...

In the real time formulation of finite temperature field theories, one introduces an additional set of fields (type-2 fields) associated to each field in the original theory (type-1 field). In [1], in the context of the AdS-CFT correspondence, Maldacena interpreted type-2 fields as living on a boundary behind the black hole horizon. However, below the Hawking-Page transition temperature, the th...

We present an effective field theory model for QCD at finite temperature with quarks. We discuss the mean field theory, the fixing of parameters, and a prediction for the curvature of the critical line. We proceed to write down a pionic theory of fluctuations around the mean field, and discuss how the parameters of this pionic effective theory descend from the model with quarks.

The quantum dynamics of the symmetry broken λ(Φ) scalar field theory in the presence of an homogeneous external field is investigated in the large N limit. We consider an initial thermal state of temperature T for a constant external field J . A subsequent sign flip of the external field, J → −J , gives rise to an out of equilibrium nonperturbative quantum field dynamics. We review here the dyn...

We investigate the radiatively induced Chern-Simons-like term in fourdimensional field theory at finite temperature. The Chern-Simons-like term is temperature dependent and breaks the Lorentz and CPT symmetries. We find that this term remains undetermined although it can be found unambiguously in different regularization schemes at finite temperature.

Heat kernel expansions at finite temperature of massless QCD and chiral quark models generate effective actions relevant for both low and high temperature QCD. The key relevance of the Polyakov Loop to maintain the large and non-perturbative gauge invariance at finite temperature is stressed. In the imaginary time formulation of quantum field theory [1], finite temperature is introduced by impo...

There has been significant progress in our understanding of finite-temperature field theory over the past decade. In this paper, we review the progress in perturbative thermal field theory focusing on thermodynamic quantities. We first discuss the breakdown of naive perturbation theory at finite temperature and the need for an effective expansion that resums an infinite class of diagrams in the...