具有对数标量场的布兰斯-迪克理论中的广义幽灵暗能量模型

IF 1.5 4区 物理与天体物理 Q3 ASTRONOMY & ASTROPHYSICS Modern Physics Letters A Pub Date : 2024-04-26 DOI:10.1142/s0217732324500469
Pinki, Pankaj Kumar, C. P. Singh
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引用次数: 0

摘要

我们在平坦的弗里德曼-勒梅特尔-罗伯逊-沃克宇宙框架内研究布兰斯-迪克理论中的广义幽灵暗能量模型。我们假定布兰-迪克标量场的对数形式在尺度因子方面具有良好的激励性,从而找到状态方程参数wg和减速参数q等观测参数。我们观察到减速参数与时间有关,这表明宇宙最近正处于从减速膨胀到加速膨胀的阶段性转变。此外,模型还显示宇宙未来将经历两次阶段转换,即近期加速膨胀到减速膨胀,以及再次减速膨胀到加速膨胀。我们还在 wg-wg′ 平面上绘制了模型在不同参数值下的运行轨迹,并探索了冻结和解冻区域。此外,我们还采用声平方速度法检验了模型的稳定性,发现在适当的参数范围内模型是稳定的。
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Generalized ghost dark energy model in Brans–Dicke theory with logarithmic scalar field

We study generalized ghost dark energy model in Brans–Dicke theory within the framework of flat Friedmann–Lemaitre–Robertson–Walker Universe. We assume the well-motivated logarithmic form of Brans–Dicke scalar field in terms of the scale factor to find the observational parameters such as equation of state parameter wg and deceleration parameter q. It is observed that the equation of state parameter crosses the phantom divide line (wg=1) for a suitable range of model parameters. We observe that the deceleration parameter is time-dependent which shows the recent phase transition from decelerated to accelerated expansion of the Universe. Moreover, the model shows that the Universe will go through two future phase transitions, recent accelerated expansion to decelerated expansion and again decelerated expansion to accelerated expansion. We have also plotted the trajectories of the model in the wgwg plane for different values of parameters and explored the freezing and thawing regions. Further, we apply the sound squared speed method to check the stability of the model and found that the model is stable for suitable range of parameters.

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来源期刊
Modern Physics Letters A
Modern Physics Letters A 物理-物理:核物理
CiteScore
3.10
自引率
7.10%
发文量
186
审稿时长
3 months
期刊介绍: This letters journal, launched in 1986, consists of research papers covering current research developments in Gravitation, Cosmology, Astrophysics, Nuclear Physics, Particles and Fields, Accelerator physics, and Quantum Information. A Brief Review section has also been initiated with the purpose of publishing short reports on the latest experimental findings and urgent new theoretical developments.
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