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By adopting the background field method, the response of the dressed quark propagator to the presence of finite chemical potential is analysed up to the second order. From this, we obtain a model-independent formula for the chemical potential dependence (up to the second order) of the in-medium two-quark condensate and show by both Lorentz covariance arguments and explicit calculations that the O(μ) contribution to the in-medium two-quark condensate vanishes identically. 相似文献
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研究了对 Faddeev- Popov方法有关键意义的局域规范群上不变测度的存在性问题 .证明了局域规范群 C∞ (M,G) (M为一紧致流形 ,G为一矩阵李群 )上不存在有限的平移不变的正测度. In is proved that on the local gauge group C ∞ (M,G) ( M a compact manifold and G a matrix Lie group) there does not exist a finite positive invariant measure. 相似文献
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We give a direct method for calculating the quark-number susceptibility at finite chemical potential and zero temperature. In this approach the quark-number susceptibility is totally determined by G[μ](p) (the dressed quark propagator at finite chemical potential μ). By applying the general result in our previous study [Phys. Rev. C 71 (2005) 015205, 034901, 73 (2006) 016004 ] G[μ](p) is calculated from the model quark propagator proposed by Pagels and Stokar [Phys. Rev. D 20 (1979) 2947]. The full analytic expression of the quark-number susceptibility at finite μ and zero T is obtained. 相似文献
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孙为民 《浙江大学学报(理学版)》2019,46(2):196-201
研究了自由电磁场理论中从库伦规范到一类较广泛的静态规范的量子规范变换,得到了静态规范中的形式场论结构,包括对易关系、运动方程、Poincaré变换生成元,并检验了由核子自旋结构问题所提出的规范场理论动量和角动量算符分解的生成元判据,丰富和充实了相关研究结果。 相似文献
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The prevailing theoretical quark and gluon momentum,orbital angular momentum and spin operators,satisfy either gauge invariance or the corresponding canonical commutation relation,but one never has these operators which satisfy both except the quark spin.The conflicts between gauge invariance and the canonical quantization requirement of these operators are discussed.A new set of quark and gluon momentum,orbital angular momentum and spin operators,which satisfy both gauge invariance and canonical momentum and angular momentum commutation relation,are proposed.To achieve such a proper decomposition the key point is to separate the gauge field into the pure gauge and the gauge covariant parts.The same conflicts also exist in QED and quantum mechanics,and have been solved in the same manner.The impacts of this new decomposition to the nucleon internal structure are discussed. 相似文献
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离子选择性中性载体液膜光极的响应性能与液膜厚度 总被引:4,自引:0,他引:4
用钙离子光极探讨了中性载液膜光极液膜厚与其各主要响应性能的关系。结果表明光极的浓度线性响应范围与膜厚无关。 相似文献
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加筋壁板轴压载荷下后屈曲稳定性试验研究 总被引:5,自引:0,他引:5
对11种构型的民用飞机机身加筋曲板在轴压载荷下后屈曲承载能力进行了试验和工程算法研究,深入探索了机身壁板的各种破坏模式,对极限法、Johnson)物线法与欧拉法三种工程算法比较,并且把试验结果与计算结果进行了对比。研究结果表明:壁板后屈曲轴压许用值与桁条剖面积和蒙皮厚度成线形关系,主要取决于桁条剖面积;蒙皮的局部屈曲应力对初始缺陷敏感,但局部屈曲应力的偏差对壁板的轴压破坏载荷影响不明显;与工程计算结果对比发现Johnson抛物线法计算的破坏轴压与试验结果吻合较好。 相似文献