Singularity attenuation with quantum-mechanically revisited metric tensor

IF 1.1 4区 物理与天体物理 Q3 ASTRONOMY & ASTROPHYSICS Astronomische Nachrichten Pub Date : 2024-01-24 DOI:10.1002/asna.20240003
Abdel Nasser Tawfik, Tahia F. Dabash, Azzah Elshehri
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Abstract

The space and initial singularities are reexamined in the most reliable solutions to the Einstein's field equations (EFE), that is, the Einstein–Gilbert–Straus (EGS) metric. In discretized Finsler geometry, additional curvatures and thereby geometric structures likely emerge, which are distinct from the conventional spacetime curvatures and geometric structures that the Einstein's theory of general relativity introduced. The generalized fundamental tensor, which is obtained in the Fisleriean geometry, imposes quantum-mechanically revisions on the Landau–Raychaudhuri evolution equations. The time-like geodesic congruence in EGS metric is then analyzed, analytically and numerically. The evolution of a family of trajectories whose congruence is defined by the flow lines generated by velocity fields is determined. We conclude that both two types of singularities seem to be attenuated or even regulate. With the singularity attenuation, we refer to the fundamental nature of the additional curvatures at quantum relativistic scales.

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量子力学重访度量张量的奇点衰减
在爱因斯坦场方程(EFE)最可靠的解,即爱因斯坦-吉尔伯特-斯特劳斯(EGS)度量中,对空间和初始奇点进行了重新研究。在离散化的芬斯勒几何中,可能会出现额外的曲率和几何结构,它们与爱因斯坦广义相对论引入的传统时空曲率和几何结构不同。在费斯勒几何中得到的广义基本张量对朗道-雷乔杜里演化方程进行了量子力学修正。然后对 EGS 度量中的类时间大地一致性进行了分析和数值计算。我们确定了由速度场产生的流线所定义的同位性轨迹族的演化过程。我们得出的结论是,这两种奇点似乎都被衰减甚至调节了。关于奇点衰减,我们指的是量子相对论尺度下附加曲率的基本性质。
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来源期刊
Astronomische Nachrichten
Astronomische Nachrichten 地学天文-天文与天体物理
CiteScore
1.80
自引率
11.10%
发文量
57
审稿时长
4-8 weeks
期刊介绍: Astronomische Nachrichten, founded in 1821 by H. C. Schumacher, is the oldest astronomical journal worldwide still being published. Famous astronomical discoveries and important papers on astronomy and astrophysics published in more than 300 volumes of the journal give an outstanding representation of the progress of astronomical research over the last 180 years. Today, Astronomical Notes/ Astronomische Nachrichten publishes articles in the field of observational and theoretical astrophysics and related topics in solar-system and solar physics. Additional, papers on astronomical instrumentation ground-based and space-based as well as papers about numerical astrophysical techniques and supercomputer modelling are covered. Papers can be completed by short video sequences in the electronic version. Astronomical Notes/ Astronomische Nachrichten also publishes special issues of meeting proceedings.
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