涉及曲率-物质耦合的扩展引力框架中的弹跳宇宙情景

IF 10.2 4区 物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS
M. Zubair , Quratulien Muneer , Saira Waheed , G. Dilara Açan Yildiz , Ertan Gudekli
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引用次数: 0

摘要

对修正理论中宇宙弹跳模型的探索在现代宇宙学中颇受欢迎。本文以指数反弹、振荡反弹、幂律反弹和物质反弹四种著名的宇宙反弹模型为研究对象,探讨了一种新理论即F(R,Lm,T)框架的拉格朗日函数。我们的主要目的是确定每种模型的 F(R,Lm,T)函数形式,并研究哪种重构的拉格朗日函数在解析形式上具有再生弹跳情景的潜力。结果表明,除幂律模型外,只有在这些弹跳模型的某些情况下才可能得到解析解。对于幂律反弹,拉格朗日函数的不同情况都可以通过分析重建,而对于其他一些反弹情况,我们发现并不总是可以获得特定的解,因此只能探索补充解。此外,我们还研究了能量约束的行为以及这些通过分析形成的弹跳解的稳定性。此外,我们确定 F(R,Lm,T)引力中的暗能量阶段与 BAO+Sne-Ia+CMB+H(z)的实验数据是兼容的,并证明在这种引力中暗能量时代可以产生宇宙反弹。我们还提出了哈勃参数值和ΛCDM对模型参数的一些约束,通过最小二乘法和缩小二乘法确定模型的最佳拟合值。结论是物质反弹模型与观测数据集以及ΛCDM模型拟合得最好,因为它的χm2值最小。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Bouncing universe scenarios in an extended gravitational framework involving curvature-matter coupling
Exploration of bouncing cosmic models in modified theories has gained much popularity in modern cosmology. This paper explores the Lagrangian function of a new theory namely F(R,Lm,T) framework by taking four renowned cosmic bouncing models, i.e., the exponential bounce, oscillatory bounce scenario, power law, and matter bouncing. Our primary objective is to fix the form of F(R,Lm,T) function for each model and investigate which kinds of reconstructed Lagrangian function have potential of regenerating bouncing scenario in terms of analytical form. It is seen that except power law model, the analytical solutions are conceivable only for certain cases of these bouncing models. For power law bounce, different cases of Lagrangian function may be rebuilt analytically while for some other bouncing scenarios, it is found that particular solutions are not always attainable and hence only the complimentary solutions can be explored. Further, we examine the behavior of energy constraints and stability of these analytically formed bouncing solutions. Additionally, we determine that the dark energy phase in F(R,Lm,T) gravity is compatible with the experimental data of BAO+Sne-Ia+CMB+H(z) and it is shown that cosmic bounce can be produced with dark energy eras in this gravity. We also present some constraints on the model parameters with Hubble parameter values and ΛCDM to determine the best-fit values of model via least square and reduced chi-squares methods. It is concluded that matter bounce model is the best fitted with the observational data set as well as ΛCDM model because it has least value of χm2.
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来源期刊
Journal of High Energy Astrophysics
Journal of High Energy Astrophysics Earth and Planetary Sciences-Space and Planetary Science
CiteScore
9.70
自引率
5.30%
发文量
38
审稿时长
65 days
期刊介绍: The journal welcomes manuscripts on theoretical models, simulations, and observations of highly energetic astrophysical objects both in our Galaxy and beyond. Among those, black holes at all scales, neutron stars, pulsars and their nebula, binaries, novae and supernovae, their remnants, active galaxies, and clusters are just a few examples. The journal will consider research across the whole electromagnetic spectrum, as well as research using various messengers, such as gravitational waves or neutrinos. Effects of high-energy phenomena on cosmology and star-formation, results from dedicated surveys expanding the knowledge of extreme environments, and astrophysical implications of dark matter are also welcomed topics.
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