Goldstone theorem

Basing on the Cornwall-Jackiw-Tomboulis (CJT) effective action approach, a theoretical formalism is established to study the Phase Transition in a binary mixture. The effective potential, which preserves the Goldstone theorem, is found in the Hartree-Fock (HF) approximation. This quantity is then used to consider the equation of state and the phase transition of the system.

11p larachdumlanat127 20-12-2020 11 2   Download

The thermal and quantum phase transitions are studied basing on the Cornwall-Jackiw-Tomboulis (CJT) effective action approach for the relativistic linear sigma model of the two-component mixing system. After obtaining the expression of the thermodynamic potential in Hartree-Fock (HF) approximation, which preserves the Goldstone theorem, the numerical results show that there may be two phase transition scenarios in the system.

8p viedison2711 03-09-2019 11 1   Download

The Bose - Einstein condensation of ultra - cold Bose gases is studied by means of the Cornwall - Jackiw - Tomboulis effective potential approach in the improved double - bubble approximation which preserves the Goldstone theorem. The phase structure of Bose - Einstein condensate associating with two different types of phase transition is systematically investigated. Its main feature is that the symmetry which was broken at zero temperature gets restored at higher temperature.

9p thuyliebe 09-10-2018 21 0   Download