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arXiv 2101.08261gr-qcastro-ph.CO
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黑洞阴影探测修正引力

Black hole shadow to probe modified gravity

A. Stepanian, Sh. Khlghatyan, V. G. Gurzadyan

摘要:

在考虑宇宙学常数Λ的情况下,研究了Schwarzschild-de Sitter和Kerr-de Sitter度规下的黑洞阴影.基于已报道的M87* 黑洞阴影的参数,我们得到了对$Λ$的约束,并表明与宇宙学数据的一致性。结果表明,Λ项与自旋参数的耦合揭示了光子球的特殊性,从而也揭示了阴影的特殊性。在参数化后牛顿形式下,得到了相应的Λ-确定参数的约束条件.

英文摘要:

We study the black hole's shadow for Schwarzschild - de Sitter and Kerr - de Sitter metrics with the contribution of the cosmological constant Λ. Based on the reported parameters of the M87* black hole shadow we obtain constraints for the $Λ$ and show the agreement with the cosmological data. It is shown that, the coupling of the Λ-term with the spin parameter reveals peculiarities for the photon spheres and hence for the shadows. Within the parametrized post-Newtonian formalism the constraint for the corresponding Λ-determined parameter is obtained.

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