标题： 一些引力物体多极矩突然变化的物理后果 显示英文标题

标题： Some Physical Consequences of Abrupt Changes in the Multipole Moments of a Gravitating Body

摘要： 巴雷比斯-伊萨拉理论在广义相对论中用于明确展示，一般来说，一个类光壳伴随着一个冲击型引力波。 该引力波通过其对Weyl共形曲率张量中狄拉克δ函数项的Petrov类型N贡献来识别（δ函数在波和壳的类光超曲面历史上出现奇异）。 描述了一个例子，其中渐近平坦的静态真空Weyl时空在其孤立轴对称源的多极矩上经历了一个突然的变化。 一个类光壳和一个冲击型引力波被识别出来，它们都以该类光超曲面为历史。 壳中的应力能量在远离源的大距离处主要由源的单极矩（质量）的跃变所主导，而四极矩的跃变主要负责应力的各向异性。 引力波的存在主要归因于源的四极矩的跃变，这证实了预期的结果。 显示英文摘要

摘要： The Barrab\`es-Israel theory of light-like shells in General Relativity is used to show explicitly that in general a light-like shell is accompanied by an impulsive gravitational wave. The gravitational wave is identified by its Petrov Type N contribution to a Dirac delta-function term in the Weyl conformal curvature tensor (with the delta-function singular on the null hypersurface history of the wave and shell). An example is described in which an asymptotically flat static vacuum Weyl space-time experiences a sudden change across a null hypersurface in the multipole moments of its isolated axially symmetric source. A light-like shell and an impulsive gravitational wave are identified, both having the null hypersurface as history. The stress-energy in the shell is dominated (at large distance from the source) by the jump in the monopole moment (the mass) of the source with the jump in the quadrupole moment mainly responsible for the stress being anisotropic. The gravitational wave owes its existence principally to the jump in the quadrupole moment of the source confirming what would be expected.