scholarly journals Three-loop pressure and susceptibility at finite temperature and density from hard-thermal-loop perturbation theory

2014 ◽  
Vol 89 (6) ◽  
Author(s):  
Najmul Haque ◽  
Jens O. Andersen ◽  
Munshi G. Mustafa ◽  
Michael Strickland ◽  
Nan Su
Keyword(s):  
Perturbation Theory ◽  
Finite Temperature ◽  
Hard Thermal Loop

GAUGE INDEPENDENCE OF THE FERMION DAMPING RATE IN A HOT PLASMA - LANDAU GAUGE VS COULOMB GAUGE

1993 ◽  
Vol 08 (08) ◽  
pp. 739-748
Author(s):  
H. NAKKAGAWA ◽  
A. NIÉGAWA ◽  
B. PIRE
Keyword(s):  
Perturbation Theory ◽  
Gluon Propagator ◽  
Landau Gauge ◽  
Coulomb Gauge ◽  
Leading Order ◽  
Loop Order ◽  
Hard Thermal Loop ◽  
Hot Plasma ◽  
Damping Rate

The damping rate of a heavy muon/quark in a hot QED/QCD plasma is calculated in the Landau gauge to the effective one-loop order in the resummed perturbation theory of Braaten and Pisarski. For both a muon/quark at rest and in an energetic case we obtain to leading order the same result as in the Coulomb gauge. Resummation of hard-thermal loop corrections to the photon/gluon propagator is of key importance for this gauge independence.

scholarly journals Pressure of a weakly magnetized hot and dense deconfined QCD matter in one-loop hard-thermal-loop perturbation theory

2019 ◽  
Vol 100 (3) ◽  
Author(s):  
Aritra Bandyopadhyay ◽  
Bithika Karmakar ◽  
Najmul Haque ◽  
Munshi G. Mustafa
Keyword(s):  
Perturbation Theory ◽  
Hard Thermal Loop

Reorganizing Finite Temperature Field Theory: Part I.: Scalar Field Theory

2001 ◽  
Vol 16 (supp01c) ◽  
pp. 1277-1280 ◽  
Author(s):  
Michael Strickland
Keyword(s):  
Field Theory ◽  
Perturbation Theory ◽  
Temperature Field ◽  
Finite Temperature ◽  
Weak Coupling ◽  
Weak Coupling Limit ◽  
Finite Temperature Field Theory ◽  
Expansion Point ◽  
Perturbative Limit ◽  
Standard Perturbation Theory

I present a method for self-consistently including the effects of screening in finite-temperature field theory calculations. The method reproduces the perturbative limit in the weak-coupling limit and for intermediate couplings this method has much better convergence than standard perturbation theory. The method relies on a reorganization of perturbation theory accomplished by shifting the expansion point used to calculate quantum loop corrections. I will present results from a three-loop calculation within this formalism for scalar λϕ4.

scholarly journals RKKY Interaction in Graphene at Finite Temperature

2019 ◽  
Vol 5 (2) ◽  
pp. 14 ◽  
Author(s):  
Eugene Kogan
Keyword(s):  
Perturbation Theory ◽  
Finite Temperature ◽  
Thermodynamic Potential ◽  
Short Paper ◽  
Magnetic Impurities ◽  
Zero Temperature ◽  
Rkky Interaction ◽  
Imaginary Time ◽  
Coordinate Representation

In our publication from eight years ago (Kogan, E. 2011, vol. 84, p. 115119), we calculated Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction between two magnetic impurities adsorbed on graphene at zero temperature. We show in this short paper that the approach based on Matsubara formalism and perturbation theory for the thermodynamic potential in the imaginary time and coordinate representation which was used then, can be easily generalized, and calculate RKKY interaction between the magnetic impurities at finite temperature.

DAMPING OF ULTRASOFT FERMIONS IN FINITE TEMPERATURE QED

2007 ◽  
Vol 22 (12) ◽  
pp. 903-914 ◽  
Author(s):  
A. ABADA ◽  
K. BOUAKAZ ◽  
D. DEGHICHE
Keyword(s):  
Finite Temperature ◽  
Second Order ◽  
External Momentum ◽  
Hard Thermal Loop ◽  
Gauge Fixing ◽  
Covariant Gauge

We calculate the fermion damping rates to second order in powers of the external momentum in the context of QED at finite temperature using the hard-thermal-loop summation scheme. We find the coefficients of zeroth and first orders finite whereas that of second-order logarithmically infrared sensitive. The calculation is done in covariant gauge and the result is independent of gauge fixing.

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