共查询到20条相似文献,搜索用时 140 毫秒
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多普勒频移的普遍公式 总被引:6,自引:0,他引:6
考虑了时空变换与速度合成的相对论效应,一个普遍的纵向多普勒频移公式被导出,它对声波和光波均适用,讨论了几种典型情况,结果表明介质中光波多普勒频移,不仅同光源与接收器两者的相对速度有关,也与光源、光波自相对介质速度有关。 相似文献
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在相对论情况下,质点系统的质心是一个不确定的概念,在相对论力学中,质心系(质量中心参照系)亦被有确切定义的动量中心系(系统总动量为零的参照系)所代替,本文对《相对论的质心运动定理与质量亏损》一文的论证和结果作出了评论。 相似文献
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基于相对论速度变换和同一直线上相对论多普勒效应, 给出了在接收者系下, 运动方向与位移连线不
在同一直线上的相对论多普勒效应的频率变换公式 相似文献
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分析了"尺缩效应"的导出过程及其可能引起的误解,阐述了狭义相对论关于不同惯性系对同一物体长度测量的另一种观点,并对两种不同长度测量方式进行了比较. 相似文献
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通过求解带电粒子在均匀电场中与坐标系选取无关的三维矢量相对论运动方程,进而利用洛伦兹变换方法,求得了带电粒子在E2>H2的均匀正交电磁场中相对论运动轨迹的一般三维矢量式.并使用Mathematica软件在直角坐标系中描绘了相应的粒子相对论运动轨迹图. 相似文献
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采用等效媒质处理方法来研究有限引导磁场下沿纵向运动的相对论环形电子注.首先建立运动坐标系以电子注纵向速度匀速运动,在运动坐标系中电子注可以被考虑成静止的磁化等离子体,再通过四维空间的洛伦兹变换得到电子注在静止的实验室坐标系下可以被等效为双各向异性媒质,其不仅具有张量形式的电导率和磁导率,还具有手征特性.在此基础上同时考虑了由于电子注表面波动所引起的表面电流密度.采用该方法研究了有限引导磁场下圆柱波导中沿纵向运动的相对论环形电子注,推导出该模型的色散方程,并进行了数值计算.计算结果表明该研究方法能够得到更准
关键词:
相对论环形电子注
磁化等离子体
色散特性 相似文献
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Nathan Rosen 《General Relativity and Gravitation》1971,2(2):129-148
Homogeneous isotropic models of the universe, based on the general theory of relativity, lead to the existence of a preferred
frame of reference, which is similar to the absolute space of, Newton, and a preferred time coordinate, which resembles the
absolute time of Newton. These concepts seem to be in contradiction to the principle of covariance on which the general relativity
theory is based. A theory of gravitation is therefore proposed which uses the world picture of general relativity but is not
covariant. In the three crucial tests, the proposed theory gives the same results as the general relativity theory. However,
in contrast to general relativity, the present theory predicts the emission of gravitational waves by spherically symmetric
systems, and gravitational waves are found, in general, to have both transverse and longitudinal components. 相似文献
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X. Calmet 《The European Physical Journal C - Particles and Fields》2008,54(3):501-505
We show that quantum mechanics and general relativity imply the existence of a minimal length. To be more precise, we show
that no operational device subject to quantum mechanics, general relativity and causality could exclude the discreteness of
spacetime on lengths shorter than the Planck length. We then consider the fundamental limit coming from quantum mechanics,
general relativity and causality on the precision of length measurement.
PACS 04.20.-q; 03.65.-w 相似文献
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E. Comay 《Foundations of Physics Letters》1997,10(3):245-254
The longitudinal magnetic field ascribed by Evans to a circularly polarized electromagnetic wave is discussed. It is proved
that this theory is inconsistent with special relativity. 相似文献
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It is demonstrated that in quantized general relativity one is led to Jordan-Fock type uncertainty relations implying the occurrence of cut-off lengths. We argue that these lengths (i) represent limitations on the measurability of quantum effects of general relativity and (ii) provide a cut-off length of quantum divergences. 相似文献
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利用狭义相对论对同时性的理解,指出了关于一种长度收缩佯谬解释的不妥之处,并解释了改进后的关于长度收缩佯谬的提法,证明了在不同参照系上的观测者观测所得到的结论相同. 相似文献
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No Heading The present work is devoted to massive gauge fields in special relativity with two fundamental constants- the velocity of light, and the Planck length, so called doubly special relativity (DSR). The two invariant scales are accounted for by properly modified boost parameters. Within above framework we construct the vector potential as the (1/2, 0) (0, 1/2) direct product, build the associated field strength tensor together with the Dirac spinors and use them to calculate various observables as functions of the Planck length. 相似文献