论文标题
关于旋转黑洞的dhost理论
On Rotating Black Holes in DHOST Theories
论文作者
论文摘要
使用溶液生成方法,我们以退化的高阶标量张量(DHOST)理论构建新的轴对称解。该方法包括首先考虑在DHOST理论中使用“种子”已知的解决方案,然后执行度量的错误转换以获得新的解决方案。在真空中,这两种溶液是等效的,但是当一个人认为耦合到物质时,它们在身体上变得不相等。这样,我们“破坏”隐形Kerr黑洞解决方案,并在DONSTARIY中获得了第一个分析旋转的非保健解决方案,而相关的标量场则与恒定的动力学密度有关。新解决方案的特征是三个参数:质量,旋转和异形参数,该参数编码相对于Kerr几何形状。我们探索了新型畸形的Kerr几何形状的一些几何特性,该特性不再是Ricci平坦,具有与Kerr Metric相同的奇异性,承认了一个巨大的,并且在渐近平坦。此外,Kerr溶液的隐藏对称性被打破,以更高阶段的重力理论提供了非圆形几何形状的示例。我们还讨论了地球运动,并计算其(畸形的)空方向,这是了解几何学因果结构的有趣工具。此外,为了再次说明溶液生成方法的潜力,我们提出了另一种轴对称溶液,用于从爱因斯坦 - 斯卡拉尔重力的普遍KERR溶液中获得的DONOST理论。
Using the disformal solution-generating method, we construct new axisymmetric solutions in Degenerate Higher Order Scalar Tensor (DHOST) theories. The method consists in first considering a "seed" known solution in DHOST theories and then performing a disformal transformation of the metric to obtain a new solution. In vacuum, the two solutions are equivalent but they become physically inequivalent when one considers coupling to matter. In that way, we "disform" the stealth Kerr black hole solution and we obtain a first analytic rotating non-stealth solution in DHOST theories, while the associated scalar field is time-dependent with a constant kinetic density. The new solution is characterized by three parameters: the mass, the spin and the disformal parameter which encodes the deviation with respect to the Kerr geometry. We explore some geometrical properties of the novel disformed Kerr geometry which is no more Ricci flat, has the same singularity as the Kerr metric, admits an ergoregion, and is asymptotically flat. Moreover, the hidden symmetry of the Kerr solution is broken, providing an example of a non-circular geometry in a higher order theory of gravity. We also discuss geodesic motions and compute its (disformed) null directions which are interesting tools to understand the causal structure of the geometry. In addition, to illustrate again the potentiality of the disformal solution-generating method, we present another axisymmetric solution for DHOST theories obtained from a disformal transformation of the generalized Kerr solution of Einstein-Scalar gravity.