报告题目: |
Generalized Beth--Uhlenbeck approach to correlations in quark matter |
报告人: |
Prof. David Blaschke |
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University of Wroclaw, Poland
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报告时间: |
2014-08-27 15:00 |
报告地点: |
理科楼B315 |
主办单位: |
物理系 |
简介: |
The thermodynamic potential of a bosonized (P)NJL model for quark matter in the gaussian approximation for the meson and diquark fields is given in the Beth-Uhlenbeck form. This allows a detailed discussion of bound state dissociation in hot, dense matter (Mott effect) in terms of the in-medium scattering phase shift of two-particle correlations. It is shown for the case without meson-diquark mixing that the phase shift can be separated into a continuum and a resonance part. In the latter, the Mott transition manifests itself by a change of the phase shift at threshold by $\pi$ in accordance with Levinson's theorem, when a bound state transforms to a resonance in the scattering continuum. The consequences for the contribution of pionic correlations to the pressure are discussed by evaluating the Beth-Uhlenbeck equation of state in different approximations. A similar discussion is performed for the scalar diquark channel in the normal phase. Further developments and applications of the developed approach are outlined.
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