Spin polarization and color superconductivity in the Nambu–Jona-Lasinio model at finite temperature

We investigate the possible existence of spin polarization and color superconductivity in the Nambu–Jona-Lasinio model with a tensor-type interaction at finite density and temperature. The thermodynamic potential is calculated by the functional integral method. Numerical results indicate that at low...

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Bibliographic Details
Published in:Physical review. D 2017-03, Vol.95 (5), p.054025, Article 054025
Main Authors: Matsuoka, Hiroaki, Tsue, Yasuhiko, da Providência, João, Providência, Constança, Yamamura, Masatoshi
Format: Article
Language:English
Subjects:
Chemical potential
Mathematical analysis
Mathematical models
Organic chemistry
Polarization (spin alignment)
Superconductivity
Tensors
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Summary:We investigate the possible existence of spin polarization and color superconductivity in the Nambu–Jona-Lasinio model with a tensor-type interaction at finite density and temperature. The thermodynamic potential is calculated by the functional integral method. Numerical results indicate that at low temperature and quark chemical potential the chiral condensed phase exists, and at intermediate chemical potential the color superconducting phase appears. In addition, depending on the magnitude of the tensor coupling, at large chemical potential and low temperature, a color superconducting phase and a spin polarized phase may coexist while at intermediate temperatures only the spin polarized phase occurs.
ISSN:2470-0010
2470-0029
DOI:10.1103/PhysRevD.95.054025