二次f ( Q ) $f(Q)$引力中以五弦场为特征的无奇点恒星模型

IF 5.6 3区物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY

Fortschritte Der Physik-Progress of Physics Pub Date : 2023-10-26 DOI:10.1002/prop.202300183

Piyali Bhar

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引用次数: 0

摘要

在 f ( Q ) $f(Q)$引力理论的背景下，本文提出了一个球对称五重 DE 模型。因此，f ( Q ) $f(Q)$ 的公式为 f ( Q ) = a Q 2 + Q $f(Q)=aQ^2+Q$ ，其中 Q 代表非度量标量，'a'为修正引力的耦合常数。假定由参数 ω q $\omega _q$ 定义的五元场，其中 ω q ∈ ( - 1 , - 1 3 ) $\omega _q \ in (-1,\,-\frac{1}{3})$ 控制底层流体分布的能量-动量张量。通过选择 Krori-Barua [Krori and Barua; J. Phys. A, Math. Gen. 8: 508, 1975] 提出的度量势，研究了'a'的选定值与几个物理参数之间的关系。此外，还进行了一系列详细分析，以检验所提出的恒星模型的物理有效性。简明扼要地描述了物质和几何之间的联系所导致的紧凑恒星系统的后果。我们用 M - R $M-R$ 和 M - ρ c $M-\rho _c$ 曲线研究了不同'a'值下我们目前模型的最大允许质量和半径。在 a = 0 $a=0$ 的情况下，我们可以得到通常的广义相对论（GR）标准结果。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Singularity Free Star Model Characterized by Quintessence Field in Quadratic f ( Q ) $f(Q)$ Gravity

In the context of the $f (Q)$ theory of gravity, a spherically symmetric quintessence DE model in this article is offered. For this reason, $f (Q)$ has the formula $f (Q) = a Q^{2} + Q$ , where Q stands for the non-metricity scalar and ‘a’ is the coupling constant for modified gravity has been taken into account. It is supposed that the quintessence field defined by the parameter $ω_{q}$ , where $ω_{q} \in (- 1, - \frac{1}{3})$ , controls the energy-momentum tensor of the underlying fluid distribution. The relationship between several physical parameters for the selected values of ‘a’, by choosing the metric potentials suggested by the Krori-Barua [Krori and Barua; J. Phys. A, Math. Gen. 8: 508, 1975] is investigated. Further, a number of analyses in detail to examine the physical validity of the proposed stellar model are carried out. The consequences of the compact star system caused by the connection of matter and geometry are succinctly described. The maximum allowable mass and radius for our present model for different values of ‘a’ have been studied by $M - R$ and $M - ρ_{c}$ curve. One can recover the usual general relativity (GR) standard results for $a = 0$ .

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来源期刊

Fortschritte Der Physik-Progress of Physics 物理-物理：综合

CiteScore

6.70

自引率

7.70%

发文量

审稿时长

6-12 weeks

期刊介绍： The journal Fortschritte der Physik - Progress of Physics is a pure online Journal (since 2013). Fortschritte der Physik - Progress of Physics is devoted to the theoretical and experimental studies of fundamental constituents of matter and their interactions e. g. elementary particle physics, classical and quantum field theory, the theory of gravitation and cosmology, quantum information, thermodynamics and statistics, laser physics and nonlinear dynamics, including chaos and quantum chaos. Generally the papers are review articles with a detailed survey on relevant publications, but original papers of general interest are also published.