与Kehagias-Sfetsos裸奇点轨道开普勒盘相关的光学效应
Optical effects related to Keplerian discs orbiting Kehagias-Sfetsos naked singularities
摘要：
我们证明了可能的光学签名的Kehagias-Sfetsos裸奇点时空的球对称真空解决方案的修改后的Hoclavava重力。在这样的时空中，吸积结构与标准黑洞时空中存在的吸积结构显著不同，这是由于“反引力”效应导致存在一个内部静态球，周围是开普勒圆盘。我们把注意力集中在与开普勒吸积盘相关的光学效应上，构建开普勒盘的光学外观，由于其热辐射的光谱连续谱，以及在这种盘的最里面产生的光谱轮廓线。KS裸奇点签名强烈编码的预测光学效应的特性，特别是在光谱连续和谱线的时空的强引力轮廓的情况下，由于该区域的角速度梯度的消失影响的有效性的粘度机制。我们可以得出结论，Kehagias-Sfetsos裸奇点的光学特征可以很好地与标准黑洞的特征区分开来。
英文摘要：
We demonstrate possible optical signatures of the Kehagias-Sfetsos naked singularity spacetimes representing spherically symmetric vacuum solution of the modified Hořava gravity. In such spacetimes, accretion structures significantly different from those present in the standard black hole spacetimes occur due to the "antigravity" effect causing existence of an internal static sphere surrounded by Keplerian discs. We focus our attention on the optical effects related to the Keplerian accretion discs, constructing the optical appearance of the Keplerian discs, the spectral continuum due to their thermal radiation, and spectral profiled lines generated in the innermost parts of such discs. The KS naked singularity signature is strongly encoded in the characteristics of predicted optical effects, especially in the case of the spectral continuum and spectral lines profiled by the strong gravity of the spacetimes, due to the region of the vanishing of the angular velocity gradient influencing the effectivity of the viscosity mechanism. We can conclude that optical signatures of the Kehagias-Sfetsos naked singularities can be well distinguished from the signatures of the standard black holes.
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