势场中玻色-爱因斯坦凝聚的临界温度

给出了不同于文献的势场中玻色-爱因斯坦凝聚临界温度表达式.结果揭示了势场中理想玻色子气体凝聚的临界温度与势场之间的关系，表明势场中临界温度正比于无势场情况下临界温度T０ｃ，还给出了势场的有效性判据.势场的有效性是势场与玻尔兹曼常数k和无势场情况下临界温度Ｔ０ｃ乘积ｋＴ０ｃ的比较.当势场接近或大于ｋＴ０c时，临界温度会有效增加;当势场远小于ｋＴ０c时, 势场是无效的. 关键词： 玻色-爱因斯坦凝聚 临界温度 势阱     

非单色激光场与同位素原子体系相互作用

本文研究了多模激光场与同位素原子体系相互作用动力学问题。采用混沌模型描述多模激光场，用Ｆｏｋｋｅｒ－Ｐｌａｎｃｋ方程方法，导出了有限带宽混沌场与同位素原子体系相互作用动力学方程。分析了激光线宽对同位素原子激发电离效率和选择性因子的影响。     

散射光场中的光学涡旋

散射光场中的光学涡旋叶茂，王鹏业，戴建华，张洪钧（四川大学物理系成都６１００６４）（中国科学院物理研究所北京１０００８０）ＯｐｔｉｃａｌＶｏｒｔｉｃｅｓｉｎＡＴｈｅｒｍａｌＲａｙｌｅｉｇｈＳｃａｔｔｅｒｉｎｇＬｉｇｈｔＦｉｅｌｄ￥ＭａｏＹｅ；ｐｅｎｇ...     

自对偶场与规范场相互作用理论的Faddeev-Jackiw量子化

本文采用Faddeev-Jackiw量子化方法,讨论了二维时空中一种自对偶场与规范场的相互作用理论.通过与Dirac方法的比较,建立了这两种方法的等价性.     

相对论热力学向量理论对Schawarzschild场中物质系统特性的研究

应用相对论热力学向量理论，讨论了Ｓｃｈｗａｒｚｓｃｈｉｌｄ场中球对称静态理论流体恒星结构，得到Ｔｏｌｍａｎ－Ｏｐｅｎｈｅｉｍｅｒ－Ｖｏｌｋｏｆｆ方程，并且就该引力场中粒子系统的不同运动状况做了讨论，由此得到了与经典极限相符合的效果。     

相对论热力学向量理论对Schwarzschild场中物质系统特性的研究

应用相对论热力学向量理论，讨论了Ｓｃｈｗａｒｚｓｃｈｉｌｄ场中球对称静态理想流体恒星结构，得到了Ｔｏｌｍａｎ-Ｏｐｐｅｎｈｅｉｍｅｒ-Ｖｏｌｋｏｆ方程，并且就该引力场中粒子系统的不同运动状况做了讨论，由此得到了与经典极限相符合的结果．     

基于傅立叶变换的射频场分布测量方法

提出了一种基于傅立叶变换的射频场分布测量方法，该方法可以方便地测量出射频场的分布，其测量结果与样品的均匀度无关并且可以分别观测某个像素点处的层内射频场非均匀性或某个小区域内的射频场非均匀性.     

N－N关联和有限核相对论平均场方法

密度有关的核子－介子相互作用耦合常数是在相对论平均场近似下用核物质的相对论Ｂｒｕｅｃｋｎｅｒ－Ｈａｒｔｒｅｅ－Ｆｏｃｋ近似计算的自能参数化得到的．这种密度有关的相互作用考虑了介质中Ｎ－Ｎ关联效应，用这种密度有关的相互作用来研究有限核的基态性质，如单粒子能级，平均结合能，电荷均方根半径，与实验值较好地符合，同时还与其它模型的结果进行了比较。     

高QKerr介质腔中对相干态场与Λ型三能级原子相互作用过程中光…

本文研究了一个位于高ＱＫｅｒｒ介质腔中的Λ型三能级原子与对相干态场相互作用系统中，Ｋｅｒｒ效应对光单模平均光子数，单模二阶相干性，以及Ｃａｕｃｈｙ－Ｓｃｈｗａｒｔｚ不等式的影响。     

质子射频场照射对碳—13自旋晶格弛豫的影响

用推广的Ｓｏｌｏｍｏｎ方程描述了＾１Ｈ通道加上射频场的＾１３Ｃ自旋晶格弛豫，分析表明在＾１Ｈ射频照射下＾１３Ｃ自旋晶格弛豫通常是一个三指数过程，但是在一些实验条件下可以变为单指数的；数值计算给出了满足Ｔ１＾ｃ＜Ｔ１＾Ｈ和满足Ｔ１＾ｃ＞Ｔ１＾Ｈ的＾１３Ｃ自旋晶格弛豫过程的明显差别，并显示了不同射频场强度的影响，实验观测了固体Ｌ－缬氨酸的甲基＾１３Ｃ自旋晶格弛豫，所得结果与理论分析很好符合。     

Self-Induced Electrostatic Fields

Electrostatic fields with localized sources induced by the electrostatic potential are introduced. The case in which such fields are determined by Schrödinger-like equations is considered. The problem of charge quantization is discussed.     

Fields with vanishing colour-currents

We consider spinor, scalar and vector fields with colour degrees of freedom and find the classical solutions when the constraint of vanishing colour currents is imposed. We find that there are no non-trivialc-number solutions for spinor fields transforming as a triplet under SU(3), although solutions exist for scalar and vector fields. We also show that the colour current of spinor fields coupled to an instanton is zero.     

Covariant Canonical Formalism of Fields

The canonical formalism of fields consistentwith the covariance principle of special relativity isgiven here. The covariant canonical transformations offields are affected by 4-generating functions. All dynamical equations of fields, e.g., theHamilton, Euler–Lagrange, and other fieldequations, are preserved under the covariant canonicaltransformations. The dynamical observables are alsoinvariant under these transformations. The covariantcanonical transformations are therefore fundamentalsymmetry operations on fields, such that the physicaloutcomes of each field theory must be invariant under these transformations. We give here also thecovariant canonical equations of fields. These equationsare the covariant versions of the Hamilton equations.They are defined by a density functional that is scalar under both the Lorentz and thecovariant canonical transformations of fields.     

Covariant Poisson Brackets of Classical Fields

The covariant Poisson brackets of classical fields are defined in terms of the fields covariant canonical variables. These are then consistent with the causality principle and the quantum fields covariant commutation relations.     

Electrodynamics of Magnetoelectric Media and Magnetoelectric Fields

The relationship between magnetoelectricity and electromagnetism is a subject of a strong interest and numerous discussions in microwave and optical wave physics and material sciences. The definition of the energy and momentum of the electromagnetic (EM) field in a magnetoelectric (ME) medium is not a trivial problem. The question of whether electromagnetism and magnetoelectricity can coexist without an extension of Maxwell's theory arises when the effects of EM energy propagation are studied and the group velocity of the waves in an ME medium is considered. The energy balance equation reveals unusual topological structure of fields in ME materials. Together with certain constraints on the constitutive parameters of a medium, definite constraints on the local field structure should be imposed. Analyzing the EM phenomena inside an ME material, the question “what kind of the near fields arising from a sample of such a material can be measured?” should be answered. The visualization of the ME states requires an experimental technique that is based on an effective coupling to the violation of spatial as well as temporal inversion symmetry. To observe the ME energy in a subwavelength region, it is necessary to assume the existence of first-principle near fields—the ME fields. These are non-Maxwellian near fields with specific properties of violation of spatial and temporal inversion symmetry. A particular interest to the ME fields arises in studies of metamaterials with “artificial-atoms” ME elements.     

Peculiarities of the Gravitational Interaction of Electrical and Magnetic Vortex Fields with Nonlinear Vortex-Free Fields

Russian Physics Journal - Within the framework of GRT, the properties of the gravitational interaction of magnetic and electric vortex fields with self-gravitating nonvortex fields are...     

Would-Be Local Fields

General quantum field theory is formulated for the case when the Wightman distributions can grow in momentum space as the exponential of a covariant polynomial. Appropriate spaces of test functions are introduced, and it is shown that the vacuumexpectation values can be written in terms of various associated tempered distributions, which enjoy some of the properties of ordinary Wightman distributions; in particular, they can be represented as boundary values of functions holomorphic in the usual extended tubes. Notions of locality for the tempered distributions can be introduced, which are sufficient to imply the PCT theorem and theorems on the connection between spin and statistic for the non-tempered fields. It is shown how a Haag-Ruelle theory of asymptotic states and fields may be set up. A possible line of generalisation is illustrated by the special example of fields of the type χ (□) A (x), where A is a tempered field, and χ an entire analytic function of finite exponential order.     

Moduli Fields in Warped Compactifications

We discuss the effective action of moduli fields in warped brane-world compactifications. For definiteness, a two-brane model with a bulk dilaton field and a power-law warp factor is considered. After deriving the classical four-dimensional effective action for the moduli, we present the calculation of the one-loop effective potential induced by bulk fields. A detailed discussion of renormalization is given, with emphasis on the local worldsheet operators which are generated. Finally, we outline the possible role of these operators in the stabilization of the moduli.     

String-Localized Quantum Fields and Modular Localization

We study free, covariant, quantum (Bose) fields that are associated with irreducible representations of the Poincaré group and localized in semi-infinite strings extending to spacelike infinity. Among these are fields that generate the irreducible representations of mass zero and infinite spin that are known to be incompatible with point-like localized fields. For the massive representations and the massless representations of finite helicity, all string-localized free fields can be written as an integral, along the string, of point-localized tensor or spinor fields. As a special case we discuss the string-localized vector fields associated with the point-like electromagnetic field and their relation to the axial gauge condition in the usual setting.Dedicated to Hans-Jürgen Borchers on the occasion of his 80th birthday     

Electromagnetic Fields of Non-Equilibrium Plasmas

A statistical treatment of the electromagnetic fields of a fully ionized plasma shows that there are two types of radiation. One of the radiation fields is determined by the time change of the distribution function and is characteristic of such plasmas. When the time change is due to the many-body couplings of the charges in the plasma, the radiation can be related to the nonequilibrium stress tensor. In particular, for large distances the radiation is determined by the total internal pressure in a way similar to the classical Larmor formula for a point charge.