Horndeski theory meets the McVittie solution: A scalar field theory for accretion onto cosmological black holes
Horndeski theory meets the McVittie solution: A scalar field theory for accretion onto cosmological black holes
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DOI：
10.1103/physrevd.90.084012
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发表时间：
2014-10-13
影响因子：
5
通讯作者：
Guariento, Daniel C.
中科院分区：
文献类型：
--
作者：
Afshordi, Niayesh;Fontanini, Michele;Guariento, Daniel C.
我们表明，广义McVittie时空，它代表了一个黑洞与时间相关的质量在膨胀的宇宙，是一个子类的Horndeski家庭的行动的精确解。负责黑洞和宇宙学背景之间能量传递的热流项是由高阶动力学引力编织项产生的，它概括了产生具有恒定质量的McVittie作为解的库斯库顿作用。最后，我们表明，这种推广可以理解的对偶实现的非形式变换，连接cuscuton场理论的扩展Horndeski行动不传播任何标量自由度。我们的发现为研究暗能量/修正引力理论与天体物理黑洞之间的非平凡相互作用打开了一扇新的窗口。
We show that the generalized McVittie spacetime, which represents a black hole with time-dependent mass in an expanding universe, is an exact solution of a subclass of the Horndeski family of actions. The heat-flow term responsible for the energy transfer between the black hole and the cosmological background is generated by the higher-order kinetic gravity braiding term, which generalizes the cuscuton action that yields McVittie with constant mass as a solution. Finally, we show that this generalization can be understood in terms of a duality realized by a disformal transformation, connecting the cuscuton field theory to an extension of the Horndeski action which does not propagate any scalar degrees of freedom. Our finding opens a novel window into studies of nontrivial interactions between dark energy/modified gravity theories and astrophysical black holes.