scholarly journals INTRODUCTION TO THERMAL FIELD THEORY

1993 ◽  
Vol 08 (32) ◽  
pp. 5605-5628 ◽  
Author(s):  
T. ALTHERR
Keyword(s):  
Field Theory ◽  
Phase Transitions ◽  
Thermal Field Theory ◽  
Thermal Field ◽  
Contour Method ◽  
Thermal Mass ◽  
Scalar Theory ◽  
The Third ◽  
Feynman Rules ◽  
Infrared Divergences

This is a very basic introduction and short (and of course incomplete) overview of thermal field theory. In the first part, I introduce the thermal propagator at a very simple level and give the Feynman rules using the time-path contour method. In the second part, I give examples of these rules in scalar theory and discuss the origin of the thermal mass and other important effects as infrared divergences and phase transitions. In the third part, I outline the resummation program of Braaten and Pisarski.

Phenomenological Tsallis distribution from thermal field theory

2021 ◽  
pp. 2150154
Author(s):  
Mahfuzur Rahaman ◽  
Trambak Bhattacharyya ◽  
Jan-e Alam
Keyword(s):  
Social Sciences ◽  
Field Theory ◽  
Thermal Field Theory ◽  
Thermal Field ◽  
Thermal Mass ◽  
Quantum Field ◽  
Tsallis Statistics ◽  
Tsallis Distribution ◽  
Statistical Mechanical ◽  
Thermal Part

Classical and quantum Tsallis distributions have been widely used in many branches of natural and social sciences. But, the quantum field theory of the Tsallis distributions is relatively a less explored arena. In this paper, we derive the expression for the thermal two-point functions in the Tsallis statistics with the help of the corresponding statistical mechanical formulations. We show that the quantum Tsallis distributions used in the literature appear in the thermal part of the propagator much in the same way the Boltzmann–Gibbs distributions appear in the conventional thermal field theory. As an application of our findings, we calculate the thermal mass in the [Formula: see text] scalar field theory within the realm of the Tsallis statistics.

scholarly journals Quantitative Test of Thermal Field Theory for Bose-Einstein Condensates

2003 ◽  
Vol 91 (25) ◽  
Author(s):  
S. A. Morgan ◽  
M. Rusch ◽  
D. A. W. Hutchinson ◽  
K. Burnett
Keyword(s):  
Field Theory ◽  
Thermal Field Theory ◽  
Thermal Field ◽  
Quantitative Test ◽  
Bose Einstein

scholarly journals THERMAL FIELD THEORY IN A WIRE: APPLICATIONS OF THERMAL FIELD THEORY METHODS TO THE PROPAGATION OF PHOTONS IN A ONE-DIMENSIONAL PLASMA

2011 ◽  
Vol 26 (32) ◽  
pp. 5387-5402 ◽  
Author(s):  
JOSÉ F. NIEVES
Keyword(s):  
Field Theory ◽  
Thermal Field Theory ◽  
Thermal Field ◽  
Free Field ◽  
Dynamical Variable ◽  
Effective Field ◽  
Dispersion Relations ◽  
One Dimensional ◽  
Self Energy ◽  
The One

The Thermal Field Theory methods are applied to calculate the dispersion relation of the photon propagating modes in a strictly one-dimensional (1D) ideal plasma. The electrons are treated as a gas of particles that are confined to a 1D tube or wire, but are otherwise free to move, without reference to the electronic wave functions in the coordinates that are transverse to the idealized wire, or relying on any features of the electronic structure. The relevant photon dynamical variable is an effective field in which the two space coordinates that are transverse to the wire are collapsed. The appropriate expression for the photon free-field propagator in such a medium is obtained, the one-loop photon self-energy is calculated and the (longitudinal) dispersion relations are determined and studied in some detail. Analytic formulas for the dispersion relations are given for the case of a degenerate electron gas, and the results differ from the long-wavelength formula that is quoted in the literature for the strictly 1D plasma. The dispersion relations obtained resemble the linear form that is expected in realistic quasi-1D plasma systems for the entire range of the momentum, and which have been observed in this kind of system in recent experiments.

scholarly journals On normal ordering and canonical transformations in thermal field theory

1999 ◽  
Vol 32 (7) ◽  
pp. 1185-1195 ◽  
Author(s):  
M Blasone ◽  
T S Evans ◽  
D A Steer ◽  
G Vitiello
Keyword(s):  
Field Theory ◽  
Thermal Field Theory ◽  
Thermal Field ◽  
Canonical Transformations ◽  
Normal Ordering

scholarly journals Perturbative nonequilibrium thermal field theory

2013 ◽  
Vol 88 (8) ◽  
Author(s):  
Peter Millington ◽  
Apostolos Pilaftsis
Keyword(s):  
Field Theory ◽  
Thermal Field Theory ◽  
Thermal Field

scholarly journals Two problems in thermal field theory

Pramana ◽  
2000 ◽  
Vol 55 (1-2) ◽  
pp. 113-124
Author(s):  
François Gelis
Keyword(s):  
Field Theory ◽  
Thermal Field Theory ◽  
Thermal Field
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