Symmetry Restoring Phase Transitions at High Density in a 4D
Nambu-Jona-Lasinio Model with a Single Order Parameter |
| |
Authors: | ZHOU Bang-Rong |
| |
Institution: | Department of Physics, Graduate School of the Chinese Academy of
Sciences, Beijing 100039, China
;Chinese Center of Advanced Science and Technology (World
Laboratory), Beijing 100080, China |
| |
Abstract: | High density phase transitions in a 4-dimensional Nambu-Jona-Lasinio model containing a single symmetry breaking order parameter coming from the fermion-antifermion condensates are researched
and expounded by means of both the gap equation and the effective potential
approach. The phase transitions are proven to be second-order at a high
temperature T; however at T=0 they are first- or second-order, depending on whether Λ/m(0), the ratio of the momentum cutoff Λ in the fermion-loop integrals to the dynamical fermion mass
m(0) at zero temperature, is less than 3.387 or not. The former condition
cannot be satisfied in some models. The discussions further show complete
effectiveness of the critical analysis based on the gap equation for
second order phase transitions including determination of the condition
of their occurrence. |
| |
Keywords: | Nambu-Jona-Lasinio model symmetry restoring at high density gap equation effective potential second- and first-order phase transition |
本文献已被 维普 等数据库收录! |
| 点击此处可从《理论物理通讯》浏览原始摘要信息 |
| 点击此处可从《理论物理通讯》下载免费的PDF全文 |
|