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arXiv 1105.5149gr-qcastro-ph.COhep-th
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Horava引力中的引力辐射

Gravitational Radiation in Horava Gravity

Diego Blas, Hillary Sanctuary

摘要:

研究了Horava引力低能极限下自引力双星系统的引力波辐射。我们发现,广义相对论的能量损失公式的预测已经修改了牛顿源:四极贡献被改变,部分原因是不同的传播速度的张量模式;此外,有一个额外的标量自由度的贡献。偶极贡献仅出现在较高的后牛顿阶。我们使用这些发现来约束Horava引力的低能量作用,通过将它们与观测到的双星的辐射阻尼进行比较。即使这种比较并不完全合适--因为致密物体不能用后牛顿近似来描述--它也代表了一个数量级的估计。在后牛顿度规与广义相对论一致的极限下,我们的能量损失公式为低能量下的Horava引力提供了最强的约束。

英文摘要:

We study the radiation of gravitational waves by self-gravitating binary systems in the low-energy limit of Horava gravity. We find that the predictions for the energy-loss formula of General Relativity are modified already for Newtonian sources: the quadrupole contribution is altered, in part due to the different speed of propagation of the tensor modes; furthermore, there is a monopole contribution stemming from an extra scalar degree of freedom. A dipole contribution only appears at higher post-Newtonian order. We use these findings to constrain the low-energy action of Horava gravity by comparing them with the radiation damping observed for binary pulsars. Even if this comparison is not completely appropriate - since compact objects cannot be described within the post-Newtonian approximation - it represents an order of magnitude estimate. In the limit where the post-Newtonian metric coincides with that of General Relativity, our energy-loss formula provides the strongest constraints for Horava gravity at low-energies.

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