期刊
CHINESE PHYSICS C
卷 46, 期 1, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/1674-1137/ac2ed3
关键词
NJL; finite temperature; QCD phase transition
资金
- Natural Science Foundation of Jiangsu Province [BK20140523]
- Jiangsu University [15JDG042, 4111190010]
- National Natural Science Foundation of China [11735007]
This paper discusses the issue of regularization in the NJL model for the thermal part and concludes that it is necessary to use regularization when calculating physical quantities related to the chiral condensate, but not when calculating physical quantities related to the grand potential.
The Nambu-Jona-Lasinio (NJL) model is one of the most useful tools for studying non-perturbative strong interactions in matter. Because it is a nonrenormalizable model, the choice of regularization is a subtle issue. In this paper, we discuss one of the general issues regarding regularization in the NJL model, which is whether we need to use regularization for the thermal part by evaluating the quark chiral condensate and thermal properties in the two-flavor NJL model. The calculations in this work include three regularization schemes that contain both gauge covariant and invariant schemes. We found that, regardless of the regularization scheme we choose, it is necessary to use regularization for the thermal part when calculating physical quantities related to the chiral condensate and to not use regularization for the thermal part when calculating physical quantities related to the grand potential.
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