arXiv 0804.09562008-04-07astro-phgr-qc

脉冲星-白矮星双星PSR J1141-6545的引力辐射损失

Gravitational-radiation losses from the pulsar-white-dwarf binary PSR J1141-6545

N. D. Ramesh Bhat, Matthew Bailes, Joris P. W. Verbiest

备注：: 4 pages, 2 figures, To Appear in Physical Review D
发表信息：: Phys.Rev.D77:124017,2008
DOI：: 10.1103/PhysRevD.77.124017

摘要：

在另一颗中子星或大质量白矮星的近距离双星轨道上运行的脉冲星是测试引力辐射和自引力效应预测的理想实验室。我们报告了脉冲星-白矮星双星PSR J1141-6545的新的计时测量结果，提供了强有力的证据表明，这种不对称系统具有与广义相对论一致的引力波损失。轨道被发现是衰减的速率$1.04\pm0.06$倍的广义相对论预测和夏皮罗延迟是一致的轨道倾角从闪烁测量。该系统提供了一个独特的测试平台，张量标量理论的重力，我们目前的测量放置在理论空间中的严格限制，与限制$α_0^2 < 2.1 \times 10^{-5}$弱非线性耦合和渐近极限$α_0^2 < 3.4 \times 10^{-6}$强非线性耦合，其中$α_0$是线性耦合强度的物质的基本标量场。这个渐近极限比卡西尼极限（$α_0^2 \approx 10^{-5}$）小近三倍。

英文摘要：

Pulsars in close binary orbit around another neutron star or a massive white dwarf make ideal laboratories for testing the predictions of gravitational radiation and self-gravitational effects. We report new timing measurements of the pulsar-white-dwarf binary PSR J1141-6545, providing strong evidence that such asymmetric systems have gravitational wave losses that are consistent with general relativity. The orbit is found to be decaying at a rate of $1.04\pm0.06$ times the general relativistic prediction and the Shapiro delay is consistent with the orbital inclination angle derived from scintillation measurements. The system provides a unique test-bed for tensor-scalar theories of gravity; our current measurements place stringent constraints in the theory space, with a limit of $α_0^2 < 2.1 \times 10^{-5}$ for weakly non-linear coupling and an asymptotic limit of $α_0^2 < 3.4 \times 10^{-6}$ for strongly non-linear coupling, where $α_0$ is the linear coupling strength of matter to an underlying scalar field. This asymptotic limit is nearly three times smaller than the Cassini bound ($α_0^2 \approx 10^{-5}$).

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