共查询到18条相似文献,搜索用时 62 毫秒
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给出了包含重力场贡献在内具有宇宙因子项最普遍形式的重力场方程为Rμν-gμνR/2+λgμν=8πG(T(Ⅰ)μν+T(Ⅱ)μν)/c4,这里λ为Einstein宇宙常数,T(Ⅰ)μν,T(Ⅱ)μν分别代表物质纯物质部分和纯重力场部分的能量-动量张量.物质纯重力场部分的能量-动量张量表述为T(Ⅱ)μν=(DμρDρν-gμνDαβDαβ/4)/4πG,式中Dμν的定义为Dμν=ωμ/xν-ων/xμ,ωμ≡-c2gμ0/g00.并用重力场贡献在内最普遍形式的重力场方程分别研究了几个大家所熟悉的静态和稳态重力场,像带有Einstein宇宙因子λ项球对称纯物质球外部静态度规、静态荷电球外部度规、匀速转动星体外部度规及理想纯物质星体内部静态平衡等,并进行了讨论.
关键词:
能量动量张量
重力场方程
静态重力场
稳态重力场 相似文献
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利用半度规λ(α)μ表象的数学工具定义一个对广义坐标具有协变形式的重力场矢势函数ω(α)μ≡-cλ(α)μ,给出一个具有广义协变的包含重力场贡献的重力场方程Rμν-gμνR/2+Λgμν=8πG(T(Ⅰ)μν+T(Ⅱ)μν)
关键词:
重力场方程
协变形式
能量-动量张量
量子化 相似文献
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求出了具有无迹能量动量张量的静态平面对称标量场产生的静态平面对称度规的通解,并讨论了这种度规的共形性质,对称性和奇异性等.这个通解包含了两个共形平直特解,其所代表的时空没有奇异性
关键词: 相似文献
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利用在北京正负电子对撞机上北京谱仪采集的3.6×106 ψ(2S)事例,测量了ψ(2S)新的强子衰变道ψ(2S)→ρα2和K*0K2*0+c.c.的分支比,发现二者相对于J/ψ的相应衰变道明显压制,破坏了微扰QCD理论预言的“15%规则”,从而继前已报道的ψ(2S)→ωf2确认了另外两例末态为矢量与张量介子的ψ(2S)反常衰变. 相似文献
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Divergenceless expression for the energy-momentum tensor of scalar field is obtained using the momentum cut-off regularization
technique. We consider a scalar field with quartic self-coupling in a spatially flat (3+1)-dimensional Robertson-Walker space-time,
having arbitrary mass and coupled to gravity. As special cases, energy-momentum tensor for conformal and minimal coupling
are also obtained. The energy-momentum tensor is observed to exhibit trace anomaly in curved space-time 相似文献
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在一般渐近平直的二维静态黑洞时空中,利用重正化能动张量的一般性质, 对位于两“平行板”间满足Dirichlet条件的无质量Dirac场的重正化能动张量的真空期待值进行了分析和计算, 得到了一般表达式.利用该表达式可以给出各种具体渐近平直二维静态黑洞时空中的相应Casimir力.对于重正化能动张量及Casimir力与真空态定义(包括Boulware 真空态、Hartle-Hawking真空态和Unrum真空态三种情况)、Hawking辐射和反常迹的关系分别进行了讨论,给出了相应的表达式和计算结果.
关键词:
能动张量
Casimir 效应
黑洞
真空态 相似文献
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We study the dynamics of phase ordering in the presence of an external gravitational field, namely a field that varies linearly with distance in one direction. Starting from microscopic considerations, we motivate reasonable phenomenological models for cases with nonconserved and conserved order parameter. We present detailed numerical results from our model for the case with conserved order parameter. 相似文献
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Z. Y. Turakulov 《Pramana》2009,72(3):473-479
In mechanics of the mass point passage from one frame of reference to another moving with velocity consists in subtracting this vector from the velocity of the particle. In general case the vector is not constant, as, for example, when passing through a rotating frame, this operation creates inertial forces. Analysis
of this phenomenon from the point of view of Lagrangian and Hamiltonian mechanics is interesting from the general relativistic
point of view due to Einstein’s principle of equivalence. We show that the vector plays the role of vector potential which, however, essentially differs from vector potential known in classical electrodynamics.
Comparative analysis of the two kinds of vector potentials is completed.
相似文献
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J.Q. Shen 《Annalen der Physik》2004,13(9):532-553
Gravitomagnetic charge that can also be referred to as the dual mass or magnetic mass is the topological charge in gravity theory. A gravitomagnetic monopole at rest can produce a stationary gravitomagnetic field. Due to the topological nature of gravitomagnetic charge, the metric of spacetime where the gravitomagnetic matter is present will be nonanalytic. In this paper both the dual curvature tensors (which can characterize the dynamics of gravitational charge/monopoles) and the antisymmetric gravitational field equation of gravitomagnetic matter are presented. We consider and discuss the mathematical formulation and physical properties of the dual curvature tensors and scalar, antisymmetric source tensors, dual spin connection (including the low‐motion weak‐field approximation), dual vierbein field as well as dual current densities of gravitomagnetic charge. It is shown that the dynamics of gravitomagnetic charge can be founded within the framework of the above dual quantities. In addition, the duality relationship in the dynamical theories between the gravitomagnetic charge (dual mass) and the gravitoelectric charge (mass) is also taken into account in the present paper. 相似文献