Ref HAL: hal-00394236_v1
DOI: 10.1142/S0218301307008446
WoS: 000252267800014
Exporter : BibTex | endNote
1 Citation
Résumé:

We study the phase diagram of the 3d massless Gross–Neveu model with different numbers of fermionic species, N. Using the Optimized Perturbation Theory technique, the free energy is evaluated at finite temperature and chemical potential. The analytical results allow us to calculate critical quantities for any value of N and, in the present work, we choose de values N = 1,3,4,10. In addition, we determine the evolution of the tricritical points, in the temperature versus chemical potential plane for these different values of N.