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arXiv 2104.13834hep-thgr-qc
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具有Cohomogeneity-1度量的旋转隐形黑洞

Rotating stealth black holes with a cohomogeneity-1 metric

Olaf Baake, Mokhtar Hassaine

摘要:

在五个维度,我们考虑一个一般的移位对称和宇称保持标量张量的行动,包含高达二阶协变导数的标量场。构造了一个旋转隐形黑洞解,其中度规由等动量的Myers-Perry时空给出,标量场由Hamilton-Jacobi势确定.这个非平凡的标量场有一个额外的头发与测试粒子的静止质量,解决方案不需要任何微调的耦合函数的理论。有趣的是,我们表明,非正式的变换,产生的这个标量场,并与一个恒定的程度的非正式性,叶不变(最多的同形)的迈尔斯-佩里度量具有相等的动量。这意味着,标量场的头发,以及常数非正规参数,可以始终吸收到变形度量的质量和单个角度参数的进一步重新定义。这些结果在更高的奇数维扩展与迈尔斯-佩里度规,所有的动量是相等的。度量在非形式变换下不变性的关键主要是等动量的Myers-Perry度量的余齐性。从这个观察,我们认为一般类的cohomogeneity-1度量在任意维度,我们列出的条件,确保这类度量保持不变(直到crystalomorphisms)下的非正式变换与一个恒定程度的非正式和一个标量场与恒定的动力学项。扩展到克尔-(A)dS的情况下,它被认为是旋转隐形解决方案可能存在提供一些微调的耦合函数的标量张量理论。

英文摘要:

In five dimensions we consider a general shift symmetric and parity preserving scalar tensor action that contains up to second order covariant derivatives of the scalar field. A rotating stealth black hole solution is constructed where the metric is given by the Myers-Perry spacetime with equal momenta and the scalar field is identified with the Hamilton-Jacobi potential. This nontrivial scalar field has an extra hair associated with the rest mass of the test particle, and the solution does not require any fine tuning of the coupling functions of the theory. Interestingly enough, we show that the disformal transformation, generated by this scalar field, and with a constant degree of disformality, leaves invariant (up to diffeomorphisms) the Myers-Perry metric with equal momenta. This means that the hair of the scalar field, along with the constant disformality parameter, can be consistently absorbed into further redefinitions of the mass and of the single angular parameter of the disformed metric. These results are extended in higher odd dimensions with a Myers-Perry metric for which all the momenta are equal. The key of the invariance under disformal transformation of the metric is mainly the cohomogeneity-1 character of the Myers-Perry metric with equal momenta. Starting from this observation, we consider a general class of cohomogeneity-1 metrics in arbitrary dimension, and we list the conditions ensuring that this class of metrics remain invariant (up to diffeomorphisms) under a disformal transformation with a constant degree of disformality and with a scalar field with constant kinetic term. The extension to the Kerr-(A)dS case is also considered where it is shown that rotating stealth solutions may exist provided some fine tuning of the coupling functions of the scalar tensor theory.

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