标题： 从脉冲星双星计时检验广义相对论 显示英文标题

标题： Tests of general relativity from timing the double pulsar

摘要： 双脉冲星系统PSR J0737-3039A/B的独特之处在于，两颗中子星都可以作为射电脉冲星被探测到。 这结合了与其他双脉冲星相比显著更高的平均轨道速度和加速度，表明该系统将成为广义相对论和强场 regime 中其他引力理论的最佳可用检验平台。 在这里，我们报告自发现以来2.5年的精确计时观测结果，并提出了四个独立的强场广义相对论测试。 使用两个恒星的理论无关质量比，使这些测试与以前的研究有所不同。 通过测量轨道运动的开普勒描述中的相对论修正，我们发现“后开普勒”参数s与爱因斯坦广义相对论预测的值在0.05%的不确定度范围内一致，这是迄今为止最精确的测试。 我们还表明，系统的质心横向速度非常小。 结合系统靠近太阳的位置，这一结果表明，未来利用双脉冲星进行的引力理论测试将超越目前最好的太阳系测试。 这也意味着第二个形成的脉冲星可能与通常假设的氦星核心坍缩形成方式不同。 显示英文摘要

摘要： The double pulsar system, PSR J0737-3039A/B, is unique in that both neutron stars are detectable as radio pulsars. This, combined with significantly higher mean orbital velocities and accelerations when compared to other binary pulsars, suggested that the system would become the best available testbed for general relativity and alternative theories of gravity in the strong-field regime. Here we report on precision timing observations taken over the 2.5 years since its discovery and present four independent strong-field tests of general relativity. Use of the theory-independent mass ratio of the two stars makes these tests uniquely different from earlier studies. By measuring relativistic corrections to the Keplerian description of the orbital motion, we find that the ``post-Keplerian'' parameter s agrees with the value predicted by Einstein's theory of general relativity within an uncertainty of 0.05%, the most precise test yet obtained. We also show that the transverse velocity of the system's center of mass is extremely small. Combined with the system's location near the Sun, this result suggests that future tests of gravitational theories with the double pulsar will supersede the best current Solar-system tests. It also implies that the second-born pulsar may have formed differently to the usually assumed core-collapse of a helium star.