标题： 由零宇宙弦产生的引力波 显示英文标题

标题： Gravitational Waves Generated by Null Cosmic Strings

摘要： 零宇宙弦被证明会干扰大质量物体的引力场并产生向外传播的引力波（GW）。 由直线零弦和点状大质量源引起的度规扰动作为平坦时空上线性化爱因斯坦方程的解被找到。 推导出它们在未来的类空无穷远处的解析近似。 显示由源和弦产生的时空具有渐近多齐次形式。 我们在这种时空中计算了引力波通量，并表明辐射的平均强度在弦运动方向上最大。 简要讨论了检测零弦产生的引力波的可能性。 显示英文摘要

摘要： Null cosmic strings are shown to disturb gravitational fields of massive bodies and create outgoing gravitational waves (GW). Perturbations of the metric caused by a straight null string and a point-like massive source are found as solutions to linearized Einstein equations on a flat space-time. An analytic approximation for their asymptotic at future null infinity is derived. A space-time created by the source and the string is shown to have asymptotically polyhomogeneous form. We calculate GW flux in such space-times and demonstrate that the averaged intensity of the radiation is maximal in the direction of the string motion. Opportunities to detect null string generated gravity waves are briefly discussed.