Three dimensional Yukawa models and CFTs at strong and weak couplings
Jul 7, 20208 pages
Published in:
- Phys.Rev.D 102 (2020) 6, 065005
- Published: Sep 9, 2020
e-Print:
- 2007.03784 [hep-th]
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Abstract: (APS)
The massless three-dimensional Gross-Neveu-Yukawa (GNY) and Nambu–Jona-Lasinio–Yukawa (NJLY) models at finite temperatures are analyzed within the mean field framework considering all coupling values. When the number of Dirac fermions is taken to be Nf=1/4 (GNY) and Nf=1/2 (NJLY) these models relate to the supersymmetric Wess-Zumino (WZ) theory with cubic superpotential and one superfield. In this case the results show that the strong-weak entropy density ratio decreases from the Stefan-Boltzmann value, in the weak limit, to s/sfree=31/35 at strong couplings. This value agrees with the one recently obtained by applying the large-N approximation to the supersymmetric O(N) WZ model with quartic superpotential and N superfields. When Nf=0 one obtains s/sfree=4/5 recovering, as expected, the ratio predicted in the context of the O(N) scalar model. However, contrary to the O(N) WZ model the simple Yukawa models analyzed here do not behave as CFTs for all couplings since the conformal measure exactly vanishes only at the extreme weak and strong limits although the speed of sound indicates that the deviation, at intermediate couplings, appears to be rather small. By comparing the thermal masses behavior in each case one can trace this difference as being a consequence that in the GNY/NJLY case the fermionic mass vanishes for all couplings while within the O(N) WZ it only vanishes at the weak and strong limits. On the other hand, the Yukawa bosonic dimensionless masses display a more universal behavior decreasing from 2ln[(1+5)/2], at infinite coupling, to zero (at vanishing coupling).- Formal aspects of field theory, field theory in curved space
- model: Yukawa
- dimension: 3
- field theory: conformal
- mean field approximation
- finite temperature
- strong coupling
- weak coupling
- Jona-Lasinio-Nambu model
- Wess-Zumino model
References(33)
Figures(7)
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