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A Dual Path Integral Representation for Finite Temperature Quantum Field Theory
C. Ccapa Ttira, C. D. Fosco, A. P. C. Malbouisson +1
We impose the periodicity conditions corresponding to the Matsubara formalism for Thermal Field Theory as constraints in the imaginary time path integral. These constraints are int…
A new path integral representation for the thermal partition function
C. D. Fosco, A. P. C. Malbouisson, I. Roditi
The boundary conditions corresponding to the Matsubara formalism for the partition function may be introduced as {\em constraints} in the path integral for the vacuum ampli…
Asymptotic Expansions of Feynman Amplitudes in a Generic Covariant Gauge
C. A. Linhares, A. P. C. Malbouisson, I. Roditi
We show in this paper how to construct Symanzik polynomials and the Schwinger parametric representation of Feynman amplitudes for gauge theories in an unspecified covariant gauge.…
First-order phase transitions in confined systems
C. A. Linhares, A. P. C. Malbouisson, I. Roditi
In a field-theoretical context, we consider the Euclidean model compactified in one of the spatial dimensions. We are able to determine the dependence of the transiti…