Abstract
Quantum transport theory and disoriented chiral condensate (DCC) in the Nambu-Jona-Lasinio model are investigated. The kinetic equations are derived in covariant and equal-time formulations. It is found that DCC is closely connected with the fluctuation of quark spin density. For the longitudinally expanding system, which models a highenergy nucleus-nucleus collision, a DCC present initially is quickly dissolved due to the expansion and the collision processes. However, the quantum off-shell effect leads to a strong fluctuation of DCC.
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Project supported in part by the National Natural Science Foundation of China (Grant No. 19845001) and Cao Guangbiao Foundation of Tsinghua University.
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Zhuang, P. Quantum transport theory and nonequilibrium chiral condensates. Sci. China Ser. A-Math. 41, 1315–1322 (1998). https://doi.org/10.1007/BF02882273
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DOI: https://doi.org/10.1007/BF02882273