活动标架系下O（3）非线性σ模型Lax—pair矩阵的Possion—Lie结构

在Ｏ（３）／Ｏ（２）对称空间上给出了非线性σ模型的Ｐｉｓｓｏｎ－Ｌｉｅ括号，用协变分解的方法讨论了活动标架与固定标架系的协变关系。     

活动标架系下以O(3)非线性σ模型Lax-pair矩阵的Poisson-Lie结构

在Ｏ（３）／Ｏ（２）对称空间上给出了非线性σ模型的Ｐｏｉｓｓｏｎ－Ｌｉｅ括号，用协变分解的方法讨论了活动标架与固定标架系的协变关系。     

Authors Index to Volume B5

ＡｕｔｈｏｒｓＩｎｄｅｘｔｏＶｏｌｕｍｅＢ５ＡＮＨｏｎｇｌｉｎ－－（６），５０１ＢＡＯＧｕｏｊＵｎ－－（ｌ），８ＢＡＯＪｉａｓｈａｎ－－（ｌ），４３ＣＡＩＢａｎｇｗｅｉ－－（４），３６３ＣＡＯａｃｉｎｇ－－（１），９４ＣＡＯＱｉｎｇ－－（５），４３９...     

活动标架系下O(n)非线性σ模型Laxpair矩阵的Poisson—Lie结构

在活动标架系下给出了O(n)/O(n-1)对称空间上非线性σ模型的Poisson-Lie括号,并用协变分解的方法讨论了活动标架与固定标架系的协交关系,得到的r、s矩阵可以明显地看出其依赖于场量的部分是由于S^n－1流形上的联络引起的.     

超声射流冷却SO2^—A2—^1A1激光诱导荧光激发谱

测得了３１５￣３３０ｎｍ超声射流冷却下ＳＯ２＾１Ａ２－＾１Ａ１激光诱导荧光（ＬＩＦ）激发谱，获得了７个有明显Ｋ结构的Ｃ型跃迁的转动子带分辨谱，并将７０个转动子带归属为（１，ｍ，１）－（０，０，０）和（０，ｎ，１）－（０，０，０）（４≤ｍ≤７，８≤ｎ≤１０）的跃迁带系。光谱分析得到ＳＯ２＾１Ａ２－＾１Ａ１跃迁的带源ｖ００、＾１Ａ２态弯曲振动频率ｖ′２，非谐性常数Ｘ２２′分别为（２７９５０±５）、（２     

BaSn＿（1－x）Sb＿xO＿（3－δ）和Ba＿（1－y）La＿ySnO＿（3－δ）的导电机制

测量了ＢａＳｎ＿（１－ｘ）Ｓｂ＿ｘＯ＿（３－δ）和Ｂａ＿（１－ｙ）Ｌａ＿ｙＳｎＯ＿（３－δ）样品的低温电阻率和磁化率．实验结果表明，在较低温度区域，两类样品的导电机制均是传导电子的范围可变跳跃。而在较高温度区域，ＢａＳｎ＿（１－ｘ）Ｓｂ＿ｘＯ＿（３－δ）样品的电导主要是电子从定域态到扩展态的跃迁所贡献，Ｂａ＿（１－ｙ）Ｌａ＿ｙＳｎＯ＿（３－δ）样品的电导则可能来源于电子的最近邻跳跃。     

掩模法制备高TcYBa2Cu3O7Josephson边缘结

本文利用脉冲激光沉积的定向性和掩模的阴影效应，原位沉积Ｎ－ＹＢＣＯ作为势垒层制备了高ＴｃＹＢａ２Ｃｕ３Ｏ７Ｊｏｓｅｐｈｓｏｎ边缘结，在６０Ｋ，微波辐照观察到明显的Ｓｈａｐｉｒｏ台阶，在Ｔｃ附近，Ｉｃ∽（１－Ｔ／Ｔｃ），ｎ＝１．８８。     

ZnCdse－ZnSe多量子阱中的激子发光

在７７－３００Ｋ温度下研究了Ｚｎ（１－ｘ）ＣｄｘＳｅ－ＺｎＳｅ多量子阱（ＭＱＷｓ）的光致发光特性．首次在７７Ｋ，Ａｒ离子激光器的４５７．９ｎｍ激发下，在Ｚｎ（０．６８）Ｃｄ（０．３２）Ｓｅ－ＺｎｓｅＭＱＷｓ中观测到５个发光带，其中三个发光带被归因于不同的激子发射：即ｎ＝１重空穴（ＨＨ）激子；ｎ＝ｌ轻－重空穴（ＬＨ）激子和ｎ＝ＩＨＨ激子同时发射两个纵光学声子的复合发光，并且，；ｎ＝１ＨＨ激子发光可延续至室温．     

Single－Mode CW 532nm Output of 1．3W by Internal Frequency Doubling with Ti：MgO：LiNbO_3

Ｓｉｎｇｌｅ－ＭｏｄｅＣＷ５３２ｎｍＯｕｔｐｕｔｏｆ１．３ＷｂｙＩｎｔｅｒｎａｌＦｒｅｑｕｅｎｃｙＤｏｕｂｌｉｎｇｗｉｔｈＴｉ：ＭｇＯ：ＬｉＮｂＯ_３￥ＬＩＪｉａｎ；ＷＵＬｉｎｇ－Ａｎ（ＩｎｓｔｉｔｕｔｅｏｆＰｈｙｓｉｃｓ，ＡｃａｄｅｍｉａＳｉｎｉｃ?..     

激光诱导镁原子S—S,S—D禁戒跃迁

报道在镁金属蒸气中利用两束激光三光子共振激发原子３ｓｎｐ１Ｐ中高里德堡态时，观察到随泵浦激光功率的增强，出现３ｓ４ｓ１Ｓ０－３ｓｎｓ１Ｓ０、３ｓｎｄ１Ｄ２（ｎ≈１８～３２）偶宇称态偶极禁戒跃迁增强，以及３ｓｎｓ１Ｓ０能级移动现象，并解释为光泵过程引起的原子激发态碰撞效应。利用禁戒跃迁首次测定了Ｍｇ３ｓｎｓ１Ｓ０（ｎ＝２２～３０）能级。     

Hamiltonian approach to frame dragging

A Hamiltonian approach makes the phenomenon of frame dragging apparent “up front” from the appearance of the drag velocity in the Hamiltonian of a test particle in an arbitrary metric. Hamiltonian (1) uses the inhomogeneous force equation (4), which applies to non-geodesic motion as well as to geodesics. The Hamiltonian is not in manifestly covariant form, but is covariant because it is derived from Hamilton’s manifestly covariant scalar action principle. A distinction is made between manifest frame dragging such as that in the Kerr metric, and hidden frame dragging that can be made manifest by a coordinate transformation such as that applied to the Robertson–Walker metric in Sect. 2. In Sect. 3 a zone of repulsive gravity is found in the extreme Kerr metric. Section 4 treats frame dragging in special relativity as a manifestation of the equivalence principle in accelerated frames. It answers a question posed by Bell about how the Lorentz contraction can break a thread connecting two uniformly accelerated rocket ships. In Sect. 5 the form of the Hamiltonian facilitates the definition of gravitomagnetic and gravitoelectric potentials.     

The Koszul formulae for graded Lie-Cartan pairs (super BRS operator)

This note is a sequel to the paper [1] codifying the /2-graded (i.e. fermionic) differential calculus within the frame of «graded Lie-Cartan pairså. We here present in this frame the Koszul formulae for the generalized exterior derivative, resp. the generalized covariant exterior derivative. The latter yields in particular the cohomological aspect of the «super BRS operatorå.     

带电粒子在电磁场中动态受力平衡条件

导体的电平衡条件为E =0 ,这是静电学中一个重要结论 ,但它显然不是相对论协变的 .由于洛伦兹力公式F =q(E +v×B)为相对论协变式 ,故带电粒子 (包括导体中的自由电子 )在电磁场中动态受力平衡条件即应为E +v×B =0 .这个条件是相对论协变的 ,即它在任何惯性系中均成立 .     

Covariance of spontaneous symmetry breaking in non-inertial frames

It is pointed out that contrary to a recent claim the process of symmetry breaking is covariant in a non-inertial frame.     

Unified Field Theory From Enlarged Transformation Group. The Covariant Derivative for Conservative Coordinate Transformations and Local Frame Transformations

Pandres has developed a theory in which the geometrical structure of a real four-dimensional space-time is expressed by a real orthonormal tetrad, and the group of diffeomorphisms is replaced by a larger group called the conservation group. This paper extends the geometrical foundation for Pandres’ theory by developing an appropriate covariant derivative which is covariant under all local Lorentz (frame) transformations, including complex Lorentz transformations, as well as conservative transformations. After defining this extended covariant derivative, an appropriate Lagrangian and its resulting field equations are derived. As in Pandres’ theory, these field equations result in a stress-energy tensor that has terms which may automatically represent the electroweak field. Finally, the theory is extended to include 2-spinors and 4-spinors.     

Conformal invariant cosmological perturbations via the covariant approach:multicomponent universe

In recent years there has been a lot of interest in discussing frame dependences/independences of the cosmological perturbations under the conformal transformations. This problem has previously been investigated in terms of the covariant approach for a single component universe, and it was found that the covariant approach is very powerful to pick out the perturbative variables which are both gauge and conformal invariant. In this work, we extend the covariant approach to a universe with multicomponent fluids. We find that similar results can be derived,as expected. In addition, some other interesting perturbations are also identified to be conformal invariant, such as entropy perturbation between two different components.     

Exact quantisation of the relativistic Hopfield model

We investigate the quantisation in the Heisenberg representation of a relativistically covariant version of the Hopfield model for dielectric media, which entails the interaction of the quantum electromagnetic field with the matter dipole fields, represented by a mesoscopic polarisation field. A full quantisation of the model is provided in a covariant gauge, with the aim of maintaining explicit relativistic covariance. Breaking of the Lorentz invariance due to the intrinsic presence in the model of a preferred reference frame is also taken into account. Relativistic covariance forces us to deal with the unphysical (scalar and longitudinal) components of the fields, furthermore it introduces, in a more tricky form, the well-known dipole ghost of standard QED in a covariant gauge. In order to correctly dispose of this contribution, we implement a generalised Lautrup trick. Furthermore, causality and the relation of the model with the Wightman axioms are also discussed.     

Worldline path integrals for a Dirac particle in a weak gravitational plane wave

The problem of a relativistic spinning particle interacting with a weak gravitational plane wave in (3+1) dimensions is formulated in the frame work of covariant supersymmetric path integrals. The relative Green function is expressed through a functional integral over bosonic trajectories that describe the external motion and fermionic variables that describe the spin degrees of freedom. The (3+1) dimensional problem is reduced to the (1+1) dimensional one by using an identity. Next, the relative propagator is exactly calculated and the wave functions are extracted. PACS 04.30.-w; 03.65.Ca; 03.65.Db; 03.65.Pm     

Lie-Cartan pairs

The algorithms common to exterior derivation, exterior covariant derivation and vector valued cohomology of Lie-Algebras are presented within a unified frame.