scholarly journals Resummed Perturbation Theory and Soft Modes in Chiral Transition at Finite Temperature

1997 ◽  
Vol 129 ◽  
pp. 91-96 ◽  
Author(s):  
Suenori Chiku
Keyword(s):  
Perturbation Theory ◽  
Finite Temperature ◽  
Soft Modes ◽  
Chiral Transition

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.

Perturbation theory in the polaron model at finite temperature

1985 ◽  
Vol 65 (3) ◽  
pp. 1255-1263 ◽  
Author(s):  
N. N. Bologyubov ◽  
V. N. Plechko
Keyword(s):  
Perturbation Theory ◽  
Finite Temperature ◽  
Polaron Model
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