In this paper, we study the physical properties and the equilibrium thermal radiation emission characteristics of matter forming thin accretion disks in stationary axially symmetric wormhole spacetimes. The thin disk models are constructed by taking different values of the wormhole's angular velocity, and the time averaged energy flux, the disk temperature and the emission spectra of the accretion disks are obtained. Comparing the mass accretion in a rotating wormhole geometry with the one of a Kerr black hole, we verify that the intensity of the flux emerging from the disk surface is greater for wormholes than for rotating black holes with the same geometrical mass and accretion rate. We also present the conversion efficiency of the accreting mass into radiation, and show that the rotating wormholes provide a much more efficient engine for the transformation of the accreting mass into radiation than the Kerr black holes. Therefore specific signatures appear in the electromagnetic spectrum of thin disks around rotating wormholes, thus leading to the possibility of distinguishing wormhole geometries by using astrophysical observations of the emission spectra from accretion disks.
Dynamics and Radiative Signatures of Accretion Flows onto a Kerr-like Wormhole
Tsung-Dao Lee Institute, Shanghai Jiao Tong University(上海交大李政道研究所);School of Physics and Astronomy, Shanghai Jiao Tong University(上海交通大学物理与天文学院);Key Laboratory for Particle Physics, Astrophysics and Cosmology (MOE), Shanghai Key Laboratory for Particle Physics and Cosmology, Shanghai Jiao Tong University(粒子物理、天体物理与宇宙学教育部重点实验室,上海粒子物理与宇宙学重点实验室,上海交通大学)
Stationary axisymmetric systems that allow for a separability structure
School of Liberal Arts and Sciences, Korea National University of Transportation(韩国交通大学生命科学与艺术学院);Center for Quantum Spacetime, Sogang University(西江大学量子时空中心)
Constraining Wormhole Geometries using the Orbit of S2 Star and the Event Horizon Telescope
在本文中,我们研究的可能性,有一个虫洞(WH)作为一个候选人的Sgr A $^\star$中心对象和测试这个想法,通过限制他们的几何形状使用的运动S2星和重建的阴影图像。特别地,我们考虑三个WH模型,包括爱因斯坦理论中的WH,膜世界引力和Einstein-Dirac-Maxwell理论。为此,我们约束WH喉使用的运动S2星,并表明耀斑的条件是满足的。我们还考虑了下落气体的吸积模型,研究了吸积率、电磁辐射强度和阴影像。
Institute of Molecule and Crystal Physics, Ufa Federal Research Centre, Russian Academy of Sciences(俄罗斯科学院乌法联邦研究中心分子与晶体物理研究所);Zel’dovich International Center for Astrophysics, M. Akmullah Bashkir State Pedagogical University(M.阿卜穆拉巴什基尔国立师范大学扎尔多维奇天体物理学国际中心);Department of Mathematics, Kidderpore College(基德波尔学院数学系)
Institute of Molecule and Crystal Physics, Ufa Federal Research Centre, Russian Academy of Sciences(俄罗斯科学院乌法联邦研究中心分子与晶体物理研究所);Zel’dovich International Center for Astrophysics, Bashkir State Pedagogical University(巴什基尔国立师范大学泽尔多维奇天体物理学国际中心);High Energy Cosmic Ray Research Center, University of North Bengal(北孟加拉大学高能宇宙射线研究中心)
Instituto de Astrofísica e Ciências do Espaço, Faculdade de Ciências da Universidade de Lisboa(里斯本大学理学院空间科学与天体物理研究所);Departamento de Física, Faculdade de Ciências da Universidade de Lisboa(里斯本大学理学院物理学系);Faculdade de Física, Programa de Pós-Graduação em Física, Universidade Federal do Pará(帕拉联邦大学物理学院物理研究生项目);Faculdade de Ciências Exatas e Tecnologia, Universidade Federal do Pará(帕拉联邦大学 Exactas 与技术科学学院)
Observational Signature and Additional Photon Rings of Asymmetric Thin-shell Wormhole
最近,Wang等人在[Phys. Lett. B 811(2020)135930]。另一方面,Gralla等人的工作[Phys. Rev. D 100(2019)2,024018]很好地描述了在黑洞周围存在吸积盘的情况下的光子环。在本文中,我们的灵感,彻底调查的观测外观的吸积盘周围的ATW。虽然有喉道的ATW外的时空可能与包含有事件视界的黑洞的时空相同,但我们发现ATW时空中存在明显的附加光子环。此外,在两个高度缩小的光子环之间发现了一个潜在的透镜带,我们的分析提供了一个光学观测特征,以区分ATW和黑洞。
Rotating traversable wormholes and particle dynamics in $f(R,T)$ gravity
The British University in Egypt(埃及英国大学);North-West University(西北大学);National Institute for Theoretical and Computational Sciences (NITheCS)(国家理论与计算科学研究所);Fukushima University(福岛大学);National Observatory of Athens(雅典国家天文台);Universidad Católica del Norte(北天主教学会大学);University of Science and Technology of China(中国科学技术大学)
Dymnikova-Schwinger quantum-corrected slowly rotating wormholes: Photon and spinning particle dynamics
University of KwaZulu-Natal(夸祖鲁-纳塔尔大学);Khazar University(哈扎尔大学);University Hassan II(哈桑二世大学);Ibn Tofail University(伊本·图费勒大学);Abdus Salam International Centre for Theoretical Physics(阿卜杜斯·萨拉姆理论物理国际中心);Ulugh Beg Astronomical Institute(乌鲁伯格天文研究所);Central Asian University(中亚大学);Imam Mohammad Ibn Saud Islamic University (IMSIU)(伊玛目穆罕默德·伊本·沙特伊斯兰大学);Kimyo International University in Tashkent(塔什干基莫国际大学)
Deflection angle of light for an observer and source at finite distance from a rotating wormhole
通过使用一种用广义光学度规改进的方法,最近讨论了在静止、轴对称和渐近平坦时空中距离透镜物体有限距离处的观察者和光源的光偏转[Ono,Ishihara,Asada,Phys. Rev. D 96,104037(2017)]。利用这种方法,在弱场近似下,我们研究了在离旋转Teo虫孔有限距离处的观察者和光源的光的偏转角,特别是考虑了光线在广义光学度规空间中测地曲率的贡献.我们的光偏转角结果与最近对同一虫洞的研究进行了比较,但限于渐近源和观察者[Jusufi,Ovgun,Phys. Rev. D 97,024042,(2018)],其中他们采用了Werner提出的另一种方法,通过Randers-Finsler度量使用Nazim的密切黎曼构造方法。我们证明了这两种不同的方法在渐近极限方面给出了相同的结果。我们还得到了由于到旋转虫洞的有限距离而对偏转角的修正。
Shadows of rotating traversable wormholes surrounded by plasma
Faculty of Physics, Sofia University “St. Kliment Ohridski”(索非亚大学“圣克利门特·奥赫里德斯基”物理学院);Institute of Mathematics and Informatics, Bulgarian Academy of Sciences(保加利亚科学院数学与信息学研究所)