Feasibility of measuring the Shapiro time delay over meter-scale distances
Feasibility of measuring the Shapiro time delay over meter-scale distances
复制标题
测量米级距离夏皮罗时延的可行性
DOI：
10.1088/0264-9381/27/18/185018
复制
发表时间：
2008
影响因子：
3.5
通讯作者：
S. M. 'arka
中科院分区：
文献类型：
--
作者：
P. Shawhan;S. Ballmer;S. M. 'arka
1964年，夏皮罗首次计算出光在经过大质量物体时的时间延迟，这是时空曲率的一个标志。到目前为止，所有的夏皮罗时间延迟的测量都是在太阳系距离尺度上进行的。我们表明，新一代的大规模的激光干涉仪被构造为引力波探测器，特别是先进的LIGO，将在原则上是足够敏感的测量夏皮罗时间延迟的变化所产生的适当设计的旋转物体放置在激光束附近。我们表明，这样的设备是可行的（虽然不容易）的建设，提出了一个例子设计，并计算出的信号，将被先进的LIGO检测。这提供了第一个机会来测量实验室距离尺度上的时空曲率效应。
The time delay of light as it passes by a massive object, first calculated by Shapiro in 1964, is a hallmark of the curvature of spacetime. To date, all measurements of the Shapiro time delay have been made over solar-system distance scales. We show that the new generation of kilometer-scale laser interferometers being constructed as gravitational wave detectors, in particular Advanced LIGO, will in principle be sensitive enough to measure variations in the Shapiro time delay produced by a suitably designed rotating object placed near the laser beam. We show that such an apparatus is feasible (though not easy) to construct, present an example design, and calculate the signal that would be detectable by Advanced LIGO. This offers the first opportunity to measure spacetime curvature effects on a laboratory distance scale.