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Do we need to use regularization on the thermal part in the NJL model?
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Do we need to use regularization on the thermal part in the NJL model?
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The Nambu--Jona-Lasinio (NJL) model is one of the most useful tools to study non-perturbative strong interaction matter. Because it is a nonrenormalizable model, the choosing of regularization is a subtle issue. In this paper, we discuss one of the general things of the regularization in the NJL model, which is whether we need to use the regularization on 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 no matter which regularization scheme we choose, it is necessary to use the regularization on the thermal part when calculating the chiral condensate related physics quantities and do not use the regularization on the thermal part when calculating the grand potential related physical quantities.
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