摘要
The conception of extra dimension was first introduced by Nordströmin,in order to unify electromagnetism and gravity[1].Nowadays,it has become a common idea that besides our fourdimensional spacetime,the extra spatial dimension is a relevant notion in the framework of particle physics,gravity and cosmology.Moreover,it appears in phenomenological(bottom-up)approaches and quantum gravity models such as string theories.Among others,the five-dimensional Kaluza–Klein(KK)theory is shown to recover both the electrodynamics and general relativity(GR)in the four-dimensional spacetime,where the extra dimension is considered to be a compact circle[2].
目前,额外维的概念普遍存在于粒子物理、引力理论以及宇宙学中,并且得到了理论和实验方面的广泛关注.但额外维的本质,包括维数、拓扑及其尺寸等基本问题尚无定论.本文从五维旋转黑弦模型的黑洞阴影出发,通过事件视界望远镜给出的对M87星系和SgrA星系中心超大质量黑洞的观测数据,不仅排除了该模型中存在无限大额外维的可能性,论证了额外维的紧致性质;还把紧致额外维的长度限制到2.03125~2.6 mm.该研究从黑洞阴影观测的角度支持了额外维是紧致的因而避免了Gregory-Laflamme(GL)不稳定的构想,且给出的限制范围远远小于GL不稳定性给出的结果.
作者
Zi-Yu Tang
Xiao-Mei Kuang
Bin Wang
Wei-Liang Qian
唐紫瑜;况小梅;王斌;钱卫良(School of Fundamental Physics and Mathematical Sciences,Hangzhou Institute for Advanced Study,University of Chinese Academy of Sciences,Hangzhou 310024,China;School of Physical Sciences,University of Chinese Academy of Sciences,Beijing 100049,China;Center for Gravitation and Cosmology,College of Physical Science and Technology,Yangzhou University,Yangzhou 225009,China;School of Aeronautics and Astronautics,Shanghai Jiao Tong University,Shanghai 200240,China;Escola de Engenharia de Lorena,Universidade de São Paulo,12602-810 Lorena,SP,Brazil;Faculdade de Engenharia de Guaratinguetá,Universidade Estadual Paulista,12516-410 Guaratinguetá,SP,Brazil)
基金
supported by the National Natural Science Foundation of China (12147119 and 12075202)
China Postdoctoral Science Foundation (2021M700142)
Natural Science Foundation of Jiangsu Province (BK20211601)
