具有块状粘性流体的幂律 f(Q)$f(Q)$ 宇宙学

IF 2.2 4区 物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY
Dheeraj Singh Rana, Raja Solanki, P. K. Sahoo
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引用次数: 0

摘要

在这项工作中,我们探索了一种幂律模型,具体地说,它与具有输运系数的粘性物质流体一起,被称为 "幂律模型"。得出了相应的解析解,并将其与最近的宇宙数据进行了对比。利用马尔可夫链蒙特卡洛(MCMC)采样技术,结合宇宙年表和最近发表的 Pantheon+Analysis 样本,估计任意参数的平均值。此外,一些宇宙学参数是通过对emcee获得的链进行重采样(包含6000个样本)重建的。结果发现,物质能量密度描绘了预期的正行为,而有效压力则显示了导致加速膨胀的负行为,这在有效 EoS 参数中得到了进一步预测。此外,还通过相空间分析研究了假定模型的渐近性质。结论是,假定的粘性模型成功地预测了宇宙从减速纪到稳定的加速去西特纪的演化。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Power Law 
         
            
               f
               (
               Q
               )
            
            $f(Q)$
          Cosmology with Bulk Viscous Fluid

Power Law 
         
            
               f
               (
               Q
               )
            
            $f(Q)$
          Cosmology with Bulk Viscous Fluid

Power Law f ( Q ) $f(Q)$ Cosmology with Bulk Viscous Fluid

In this work, a power law f ( Q ) $f(Q)$ model is explored, specifically, f ( Q ) = α Q n $f(Q)= \alpha Q^n$ , along with viscous matter fluid having transport coefficient ζ = ζ 0 Ω + ζ 1 Ω H $\zeta = \zeta _0 \sqrt {\Omega } + \zeta _1 \Omega H$ . The corresponding analytical solution is derived and then confronted with recent cosmic data. The Markov Chain Monte Carlo (MCMC) sampling technique is utilized to estimate the mean value of arbitrary parameters, by incorporating Cosmic Chronometers and recently published Pantheon+Analysis samples. In addition, some cosmological parameters are reconstructed by resampling the chains obtained by emcee, incorporating 6000 samples. It is found that the matter-energy density depicts the expected positive behavior, whereas the effective pressure indicates the negative behavior that is leading the accelerating expansion, which is further predicted in the effective EoS parameter. Further, the asymptotic nature of the assumed model is investigated by invoking phase-space analysis. It is concluded that the assumed viscous f ( Q ) $f(Q)$ model successfully predicts an evolution of the universe from decelerated epoch to stable accelerated de-Sitter epoch.

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来源期刊
Annalen der Physik
Annalen der Physik 物理-物理:综合
CiteScore
4.50
自引率
8.30%
发文量
202
审稿时长
3 months
期刊介绍: Annalen der Physik (AdP) is one of the world''s most renowned physics journals with an over 225 years'' tradition of excellence. Based on the fame of seminal papers by Einstein, Planck and many others, the journal is now tuned towards today''s most exciting findings including the annual Nobel Lectures. AdP comprises all areas of physics, with particular emphasis on important, significant and highly relevant results. Topics range from fundamental research to forefront applications including dynamic and interdisciplinary fields. The journal covers theory, simulation and experiment, e.g., but not exclusively, in condensed matter, quantum physics, photonics, materials physics, high energy, gravitation and astrophysics. It welcomes Rapid Research Letters, Original Papers, Review and Feature Articles.
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