Effective mass of omega meson andNNω interaction at finite temperature and density

1994 ◽  
Vol 49 (1) ◽  
pp. 40-45 ◽  
Author(s):  
Song Gao ◽  
Ru-Keng Su ◽  
Peter K. N. Yu
Keyword(s):  
Effective Mass ◽  
Finite Temperature ◽  
Omega Meson

Studies on proper time regularization and the QCD chiral phase transition

2019 ◽  
Vol 34 (01) ◽  
pp. 1950003
Author(s):  
Yu-Qiang Cui ◽  
Zhong-Liang Pan
Keyword(s):  
Phase Transition ◽  
Small Parameter ◽  
Effective Mass ◽  
Finite Temperature ◽  
Chemical Potential ◽  
Proper Time ◽  
Chiral Phase ◽  
Chiral Phase Transition ◽  
Njl Model ◽  
The Difference

We investigate the finite-temperature and zero quark chemical potential QCD chiral phase transition of strongly interacting matter within the two-flavor Nambu–Jona-Lasinio (NJL) model as well as the proper time regularization. We use two different regularization processes, as discussed in Refs. 36 and 37, separately, to discuss how the effective mass M varies with the temperature T. Based on the calculation, we find that the M of both regularization schemes decreases when T increases. However, for three different parameter sets, quite different behaviors will show up. The results obtained by the method in Ref. 36 are very close to each other, but those in Ref. 37 are getting farther and farther from each other. This means that although the method in Ref. 37 seems physically more reasonable, it loses the advantage in Ref. 36 of a small parameter dependence. In addition, we also, find that two regularization schemes provide similar results when T [Formula: see text] 100 MeV, while when T is larger than 100 MeV, the difference becomes obvious: the M calculated by the method in Ref. 36 decreases more rapidly than that in Ref. 37.

Effective mass of the surface polaron at a finite temperature

1994 ◽  
Vol 6 (40) ◽  
pp. 8167-8180 ◽  
Author(s):  
Bao-Quan Sun ◽  
Wei Xiao ◽  
Jing-Lin Xiao
Keyword(s):  
Effective Mass ◽  
Finite Temperature

Polaron density matrix and effective mass at finite temperature

1999 ◽  
Vol 60 (10) ◽  
pp. 7245-7251 ◽  
Author(s):  
Ashok Sethia ◽  
Fumio Hirata ◽  
Yoshitaka Tanimura ◽  
Yashwant Singh
Keyword(s):  
Density Matrix ◽  
Effective Mass ◽  
Finite Temperature

PHASE TRANSITIONS IN ϕ4 THEORY AT FINITE DENSITIES

1989 ◽  
Vol 04 (08) ◽  
pp. 783-789 ◽  
Author(s):  
V.J. PETER ◽  
M. SABIR
Keyword(s):  
Phase Transitions ◽  
Effective Mass ◽  
Finite Temperature ◽  
Chemical Potential ◽  
Coupling Constant ◽  
Effective Coupling ◽  
Effective Coupling Constant ◽  
The One

We study the effective mass and effective coupling constant of a self interacting O(2) symmetric ϕ4 model at finite temperature and finite chemical potential in the one-loop and improved one-loop approximations. It is shown that the restored symmetry at a finite chemical potential is again broken at a higher value of chemical potential.

THE GAUSSIAN APPROXIMATION FOR THE λφ4THEORY AT FINITE TEMPERATURE REVISITED

1991 ◽  
Vol 06 (26) ◽  
pp. 4579-4638 ◽  
Author(s):  
FRÉDÉRIQUE GRASSI ◽  
RÉMI HAKIM ◽  
HORACIO D. SIVAK
Keyword(s):  
Free Energy ◽  
Effective Mass ◽  
Effective Potential ◽  
Finite Temperature ◽  
Energy Momentum Tensor ◽  
Gaussian Approximation ◽  
Dimensional Regularization ◽  
Momentum Tensor ◽  
Effects Of Temperature ◽  
Physical Quantities

This paper is devoted to a systematic study of the λφ4 theory in the Gaussian approximation and at finite temperature. Although our results can be extended in a straightforward manner to other dimensions, only the case of four (1+3) dimensions is dealt with here. The Gaussian approximation is implemented via the moments of the field φ, a method somewhat simpler than the Gaussian functional approach. Furthermore, the effective potential (equivalently, the free energy) is calculated through the evaluation of the energy-momentum tensor of quasiparticles endowed with an effective mass. This effective mass generally obeys a gap equation, which is analyzed and solved. Besides the “precarious” solution of Stevenson or the “autonomous” one of Stevenson and Tarrach, which are recovered and rediscussed, several nonperturbative solutions, either exhibiting “spontaneous symmetry breaking” or not, are obtained with the help of systematic expansions of various physical quantities in powers of ε, the parameter occurring in the dimensional regularization scheme used throughout this paper. The effects of temperature are discussed in detail: phase transitions in the precarious or autonomous solutions occur. Other simple Gaussian (but not minimal) solutions for the effective potential (free energy) are also obtained.

The Effective Mass of Sigma Meson at Finite Temperature and Density

1994 ◽  
Vol 22 (2) ◽  
pp. 193-198 ◽  
Author(s):  
Ru-Keng Su ◽  
Wan-Heng Zhong ◽  
Zhi-Xin Qian
Keyword(s):  
Effective Mass ◽  
Finite Temperature ◽  
Sigma Meson

QUANTUM GRAVITY AT FINITE TEMPERATURE

1988 ◽  
Vol 03 (07) ◽  
pp. 667-672
Author(s):  
A.E.I. JOHANSSON ◽  
G. PERESSUTTI ◽  
B.-S. SKAGERSTAM
Keyword(s):  
Effective Mass ◽  
Effective Temperature ◽  
Gauge Invariance ◽  
Finite Temperature ◽  
Gauge Theories ◽  
Temperature Dependent ◽  
Self Energy ◽  
The One ◽  
Dependent Mass ◽  
Increasing Function

Self-energy corrections induced by the presence of thermal gravitons are computed at the one-loop level. It is found that thermal gravitons lead to a decreasing, effective temperature-dependent mass contrary to the situation in ordinary gauge theories where the effective mass is an increasing function of the temperature. It is argued that for 4πT2 larger then [Formula: see text], massive modes in the system are damped out in time or they cause instabilities. We also verify that the temperature-dependent effective mass satisfies Weinberg’s on-shell gauge invariance.

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