标题： 引力对P和T破坏的天体物理信号 显示英文标题

标题： Astrophysical signals of P and T violation by gravity

摘要： 我们研究了P和T破坏的规范不变引力子-光子相互作用的一阶观测后果。 这种相互作用导致引力双折射——光信号的速度取决于其偏振，这在爱因斯坦引力中是不存在的。 利用脉冲星无线电信号中的差分时间延迟的实验确定的限制，我们对P和T破坏的引力子-光子耦合的大小进行了约束。 显示英文摘要

摘要： We study the observational consequences of the leading order P and T violating gauge invariant graviton-photon interactions. Such interactions give rise to gravitational birefringence - the velocity of light signals depends upon their polarisation, which is absent in Einstein's gravity. Using experimentally established limits on the differential time delay in the radio signals from pulsars we put constraints on the magnitude of P and T violating graviton-photon couplings.