Neutrality Effects on the Phase Structure of the Linear Sigma Model with the Non-standard Symmetry Breaking

Tran Huu Phat, Nguyen Van Long, Nguyen Van Thu


The neutrality effects on the phase structure of the linear sigma model with the non-standard symmetry breaking term is systematically studied by means of the Cornwall-Jackiw-Tomboulis effective potential. The latter quantity is calculated in the improved Hartree-Fock approximation which preserves the Goldstone theorem and the thermodynamic consistency. Its results that in the region \(\mu > m_\pi\), as a function of the temperature \(T\), the pion condensate undergoes a second order phase transition, as a function of the isospin chemical \(\mu\), it undergoes a first order phase transition. In the region \(\mu < m_\pi\), the pion condensation is always a first order phase transition.

Full Text:


DOI: Display counter: Abstract : 121 views. PDF : 61 views.


  • There are currently no refbacks.

Editorial Office:

Communications in Physics

1st Floor, A16 Building, 18B Hoang Quoc Viet Street, Cau Giay District, Hanoi, Vietnam

Tel: (+84) 024 3791 7102 


Copyright by