共查询到17条相似文献,搜索用时 343 毫秒
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采用无规相近似(RPA)耦合集团展开方法求解薛定谔本征值方程,计算高阶胶球波函数. 在计算中,用空心Wilson圈图作为试探波函数,对特殊Wilson圈图作近似处理,计算出的2+1维SU(2)格点规范场的六阶和七阶胶球波函数的μ0F和μ2F及相关参数z 在弱耦合区(β=4.8-9.6)出现较好的标度行为,七阶真空能量在整个区域(β=0.8-8.0)与六阶真空能量一致. 相似文献
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提出变形集团展开法研究2+1维SU(3)格点规范场的胶球质量.这种方法采用相连空心图的线性组合作为试探波函数,并引入了Wilson圈图的平均值.计算结果表明,变形集团展开法的真空能量比普通集团展开法方法的真空能量低,0++胶球质量m/e2的二阶和三阶结果在耦合常数β=4.5—8.0区间,表现出较好的标度行为和良好的收敛性. 相似文献
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2+1维SU(2)格点规范场真空态的研究 总被引:3,自引:3,他引:0
对2+1维SU(2)格点规范场论真空态进行研究,推导出连续极限下真空波函数中参数μ0和μ2的普适表达式.并用基于改进的哈密顿量的截断本征方程进行数值计算,结果在深度弱耦合区内显示出良好的标度行为. 相似文献
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改进了耦合集团展开方法,计算出的2+1维SU(2)格点规范场的真空波函数的μ0和μ2比用改进前的方法所得到的结果好,在弱耦合区表现出良好的标度行为 相似文献
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改进了耦合集团展开方法,计算六阶2+1维SU(2)格点规范场的胶球波函数的μF0和μF2及相关参数ζ.在计算中,采用空心图作为试探波函数,计算结果在弱耦合区都表现出良好的标度行为. 相似文献
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采用截断本征方程的方法研究2+1维SU(2)格点规范场的胶球质量及胶球波函数.计算结果表明:五阶胶球质量Δm/e2与五阶真空波函数的μ0一样没有表现出良好的收敛行为,在1/g2>0.8区间,胶球质量逐渐下降;胶球波函数μ0F和μ2F在1/g2>0.8时,趋于平稳,有较好的标度行为. 相似文献
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2+1维U(1)格点规范场论中真空态的研究 总被引:2,自引:2,他引:0
对2+1维U(1)格点规范场论真空态进行研究,仔细推导出连续极限下真空谈函数中参数μ0和μ2的普适表达式,并用截断本征方程法进行数值计算. 相似文献
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Manasse R. Mbonye 《General Relativity and Gravitation》2002,34(11):1865-1875
We explore the dynamics of neutrinos in a vacuum dominated cosmology. First we show that such a geometry will induce a phase change in the eigenstates of a massive neutrino and we calculate the phase change. We also calculate the delay in the neutrino flight times in this geometry. Applying our results to the presently observed background vacuum energy density, we find that for neutrino sources further than 1.5 Gpc away both effects become non-trivial, being of the order of the standard relativistic corrections. Such sources are within the observable Hubble Deep Field. The results which are theoretically interesting are also potentially useful, in the future, as detection techniques improve. For example such effects on neutrinos from distant sources like supernovae could be used, in an independent method alternative to standard candles, to constrain the dark energy density and the deceleration parameter. The discussion is extended to investigate Caianiello's inertial or maximal acceleration (MA) effects of such a vacuum dominated spacetime on neutrino oscillations. Assuming that the MA phenomenon exists, we find that its form as generated by the presently observed vacuum energy density would still have little or no measurable effect on neutrino phase evolution, for neutrinos in the energy range of a few eV. 相似文献
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Self-Consistent RPA is extended in a way so that it is compatible with a variational ansatz for the ground-state wave function
as a fermionic many-body vacuum. Employing the usual equation-of-motion technique, we arrive at extended RPA equations of
the Self-Consistent RPA structure. In principle the Pauli principle is, therefore, fully respected. However, the correlation
functions entering the RPA matrix can only be obtained from a systematic expansion in powers of some combinations of RPA amplitudes.
We demonstrate for a model case that this expansion may converge rapidly. 相似文献
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热真空态的Husimi分布函数 总被引:3,自引:2,他引:1
根据量子统计中相空间的理论知识,采用两种不同的方法给出了热真空态的Husimi分布函数,并给出了热真空态的Wehrl墒.最后与相应混合态的Husimi分布函数进行比较,得出来热真空态的Husimi分布函数与混合态的Husimi分布函数是相一致的结论. 相似文献
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MENG Xiang-Guo WANG Ji-Suo LIANG Bao-Long 《理论物理通讯》2008,49(5):1299-1304
In this paper, the two-mode excited squeezed vacuum state (TESVS)
is studied by using the statistical method. By calculating the normalization
of the TESVS, a new form of Jacobi polynomials and some new identities are
obtained. The photon number distribution of the TESVS is given and it is a simple form of Jacobi polynomials. Using the entangled state representation of Wigner operator, the Wigner function of the TESVS is obtainded and the variations of the Wigner function with the parameters m, n, and r are discussed. Here from the phase space point of view the TESVS can be well interpreted and described. 相似文献
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利用原子-腔场喇曼相互作用制备纠缠压缩真空态 总被引:2,自引:2,他引:0
提出了利用量子态腔场与原子的喇曼相互作用制备纠缠压缩真空态的方案.在该方案中,一个初始制备在基态的原子被依次送入几个初始制备在压缩真空态的微腔中.通过控制原子的运行速度,使原子与每一个腔具有相同的相互作用时间.当原子与腔场发生相互作用,原子与腔场产生纠缠之后,进行原子的测量.当原子被测量处于基态或激发态时,按照量子力学波包塌缩原理,腔场态将塌缩到相应的纠缠压缩真空态.对纠缠压缩真空态的纠缠性质也进行了简略的讨论. 相似文献