论文标题
在扭转巨大的远程极限的黑洞
Black holes in the long-range limit of torsion bigravity
论文作者
论文摘要
我们继续研究扭转巨大的球形对称黑洞溶液，这是一类Einstein-Cartan型重力理论，除了度量标准外，还涉及大量的繁殖扭转场。在无限范围的极限中，这些理论允许在公制和扭转的渐近径向演化中存在有吸引力的固定点有关。我们讨论了这些固定点，以及在大半径上接近它们的方式。讨论了渐近平坦扭转头发黑洞的几个现象学方面：（i）光环和阴影的位置； （ii）校正轨道恒星的红移； （iii）修改轨道恒星的围环动物。通过将扭转型黑洞的可观察性能与事件范围望远镜协作获得的超大型黑洞的现有观察数据进行比较，并通过重力协作，我们得出了对扭力理论参数的约束。发现最强的限制是来自恒星S2的围绕银河中心巨大的大型黑洞的最新测量。天体。 636，L5（2020）]，比太阳系重力测试更严格一千倍。
We continue the study of spherically symmetric black hole solutions in torsion bigravity, a class of Einstein-Cartan-type gravity theories involving, besides a metric, a massive propagating torsion field. In the infinite-range limit, these theories admit asymptotically flat black hole solutions related to the presence of attractive fixed points in the asymptotic radial evolution of the metric and the torsion. We discuss these fixed points, and the way they are approached at large radii. Several phenomenological aspects of asymptotically flat torsion-hairy black holes are discussed: (i) location of the light ring and of the shadow; (ii) correction to the redshift of orbiting stars; and (iii) modification of the periastron precession of orbiting stars. By comparing the observable properties of torsion-hairy black holes to existing observational data on supermassive black holes obtained by the Event Horizon Telescope collaboration, and by the GRAVITY collaboration, we derive constraints on the theory parameters of torsion bigravity. The strongest constraint is found to come from the recent measurement of the periastron precession of the star S2 orbiting the Galactic-center massive black hole [Astron. Astrophys. 636, L5 (2020)], and to be a thousand times more stringent than solar-system gravitational tests.
