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arXiv 0905.1523hep-thastro-ph.HEgr-qc
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Horava-Lifshitz引力的约束

Towards constraining of the Horava-Lifshitz gravities

R. A. Konoplya

摘要:

最近有人提出了一个引力的重正化模型,它可能是广义相对论(GR)的紫外完备或其红外修正,可能具有强耦合标量模。虽然一般真空的理论是反德西特之一,特定的限制理论允许闵可夫斯基真空。在这个极限下(尽管没有考虑强耦合标量场),球对称解的后牛顿系数与广义相对论的后牛顿系数一致。因此,对于一个天体物理尺度上的强引力系统,偏离常规GR的偏差应该在后牛顿修正之外进行检验。在这封信中,我们考虑了具有Minkowski真空的变形Horava-Lifshitz引力中黑洞的潜在可观察性质:引力透镜和准正规模式。我们已经表明,弯曲角似乎是较小的考虑Horava-Lifshitz引力比在GR中。黑洞的准正规模式的寿命更长,并有更大的实际振荡频率在Horava-Lifshitz引力比在GR中。这些修正应在不久的将来的实验中观察到的透镜和引力天线,有助于约束参数的Horava-Lifshitz引力或丢弃它。

英文摘要:

Recently a renormalizable model of gravity has been proposed, which might be a UV completion of General Relativity (GR) or its infra-red modification, probably with a strongly coupled scalar mode. Although the generic vacuum of the theory is anti-de Sitter one, particular limits of the theory allow for the Minkowski vacuum. In this limit (though without consideration of the strongly coupled scalar field) post-Newtonian coefficients of spherically symmetric solutions coincide with those of the General Relativity. Thus the deviations from the convenient GR should be tested beyond the post-Newtonian corrections, that is for a system with strong gravity at astrophysical scales. In this letter we consider potentially observable properties of black holes in the deformed Horava-Lifshitz gravity with Minkowski vacuum: the gravitational lensing and quasinormal modes. We have showed that the bending angle is seemingly smaller in the considered Horava-Lifshitz gravity than in GR. The quasinormal modes of black holes are longer lived and have larger real oscillation frequency in the Horava-Lifshitz gravity than in GR. These corrections should be observable in the near future experiments on lensing and by gravitational antennas, helping to constrain parameters of the Horava-Lifshitz gravity or to discard it.

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