动力学Chern-Simons修正引力中的薄吸积盘特征
Thin accretion disk signatures in dynamical Chern-Simons modified gravity
摘要：
广义相对论的一个很有前途的扩展是Chern-Simons（CS）修正引力，其中通过增加一个宇称破坏的CS项来修正Einstein-Hilbert作用量，该CS项通过一个标量场耦合到引力。在这项工作中，我们考虑有趣的，但相对未开发的，CS修改的重力，CS耦合场被视为一个动力场，赋予自己的应力-能量张量和演化方程的动力学公式。考虑了利用慢转黑洞周围的吸积盘性质来观测检验动态CS修正引力的可能性。得到了该体系的能流、温度分布、发射光谱以及能量转换效率，并与标准广义相对论克尔解进行了比较。结果表明，Kerr黑洞比CS修正引力下的慢转黑洞提供了一个更有效的吸积质量能量转化为辐射的引擎.特定的签名出现在电磁波谱，从而导致直接测试CS修改重力的可能性，通过使用天体物理观测的发射光谱从吸积盘。
英文摘要：
A promising extension of general relativity is Chern-Simons (CS) modified gravity, in which the Einstein-Hilbert action is modified by adding a parity-violating CS term, which couples to gravity via a scalar field. In this work, we consider the interesting, yet relatively unexplored, dynamical formulation of CS modified gravity, where the CS coupling field is treated as a dynamical field, endowed with its own stress-energy tensor and evolution equation. We consider the possibility of observationally testing dynamical CS modified gravity by using the accretion disk properties around slowly-rotating black holes. The energy flux, temperature distribution, the emission spectrum as well as the energy conversion efficiency are obtained, and compared to the standard general relativistic Kerr solution. It is shown that the Kerr black hole provide a more efficient engine for the transformation of the energy of the accreting mass into radiation than their slowly-rotating counterparts in CS modified gravity. Specific signatures appear in the electromagnetic spectrum, thus leading to the possibility of directly testing CS modified gravity by using astrophysical observations of the emission spectra from accretion disks.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
