修正强引力下黑洞周围的吸积盘
Accretion disks around black holes in modified strong gravity
摘要：
恒星质量的黑洞提供了在强场区域检验引力理论的最佳方案。特别是，在宇宙学背景下被广泛讨论的f（R）理论，可以通过黑洞周围现象的现实天体物理模型来约束。我们的目标是在f（R）引力下建立Schwarzschild和Kerr黑洞薄吸积盘的辐射模型。我们研究了f（R）-Schwarzschild和Kerr时空中的粒子运动。我们给出了常Ricci标量f（R）黑洞吸积盘的谱能量分布，并利用这些系统的特征约束了特定的f（R）公式.精确测定黑洞的自旋和吸积速率，以及对它们的热谱进行X射线观测，可能有助于确定引力与广义相对论的偏差。利用最近的高质量X射线双星天鹅座X-1的数据，我们限制了一类f（R）模型的参数值。
英文摘要：
Stellar-mass black holes offer what is perhaps the best scenario to test theories of gravity in the strong-field regime. In particular, f(R) theories, which have been widely discuss in a cosmological context, can be constrained through realistic astrophysical models of phenomena around black holes. We aim at building radiative models of thin accretion disks for both Schwarzschild and Kerr black holes in f(R) gravity. We study particle motion in f(R)-Schwarzschild and Kerr space-times. We present the spectral energy distribution of the accretion disk around constant Ricci scalar f(R) black holes, and constrain specific f(R) prescriptions using features of these systems. A precise determination of both the spin and accretion rate onto black holes along with X-ray observations of their thermal spectrum might allow to identify deviations of gravity from General Relativity. We use recent data on the high-mass X-ray binary Cygnus X-1 to restrict the values of the parameters of a class of f(R) models.
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