标量场对 S2 星轨道的影响
星系天体物理
2019-09-10 v2 广义相对论与量子宇宙学
摘要
对绕 SgrA* 运行的 S 星的精确测量，已对银河系中心致密天体的性质给出了强约束。该区域存在黑洞已得到充分证实，但其邻近环境仍存争议。就此而言，该中心区域暗物质的存在或可因其对恒星轨道的强烈特征而被探测到：主要效应是一种牛顿进动，它将影响 S2 的整体近心点偏移，而后者正是 GRAVITY 仪器的目标测量量。这种暗物质的具体性质（例如恒星暗遗迹或弥散暗物质）尚不清楚。本文假设其为环绕 Kerr 黑洞、与超轻暗物质粒子相关的环向分布标量场。此类场是超辐射背景下预期的一种“毛发”，超辐射是一种从黑洞提取转动能量的机制。本文计算了 S2 星的轨道特征，并表明其可被 GRAVITY 探测到。由于轨道根素的变化既依赖于标量场相对于黑洞的相对质量，也依赖于场质量耦合参数，故该标量场可被约束。
引用
@article{arxiv.1908.06681,
title = {Scalar field effects on the orbit of S2 star},
author = {António Amorim and Michael Bauböck and Myriam Benisty and Jean-Philippe Berger and Yann Clénet and Vincent Coude du Foresto and Tim de Zeeuw and Jason Dexter and Andreas Eckart and Frank Eisenhauer and Miguel C. Ferreira and Feng Gao and Paulo J. V. Garcia and Eric Gendron and Reinhard Genzel and Stefan Gillessen and Paulo Gordo and Maryam Habibi and Matthew Horrobin and Alejandra Jiménez-Rosales and Pierre Kervella and Sylvestre Lacour and Jean-Baptiste Le Bouquin and Pierre Lena and Thomas Ott and Thibaut Paumard and Karine Perraut and Guy Perrin and Oliver Pfuhl and Gustavo Rodríguez-Coira and Gerard Rousset and Odele Straub and Christian Straubmeier and E. Sturm and Frederic Vincent and Sebastiano von Fellenberg and Idel Waisberg and Felix Widmann},
journal= {arXiv preprint arXiv:1908.06681},
year = {2019}
}
备注
17 pages, 6 figures. v2: added some references and fixed minor typos to match version in press in MNRAS