Linear Chemical Potential Dependence of Two-Quark Condensate |
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Authors: | ZONG Hong-Shi SUN Wei-Min |
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Institution: | 1. Department of Physics, Nanjing University, Nanjing 210093, China
;2. Joint Center for Particle, Nuclear Physics and
Cosmology, Nanjing 210093, China |
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Abstract: | By differentiating the inverse dressed quark propagator at finite chemical potential μ with respect to μ, the linear response of the dressed quark propagator to the chemical potential can be obtained. From this we
extract a model-independent formula for the linear chemical potential dependence of the in-medium two-quark
condensate and show by two independent methods (explicit calculation and Lorentz covariance arguments) that the
first-order contribution in μ to the in-medium two-quark condensate vanishes identically. Therefore if one wants to
study the in-medium two-quark condensate one should expand to at least the second order in the chemical
potential μ. |
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Keywords: | QCD vacuum two-quark condensate finite chemical potential |
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