arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 2604.15399gr-qc
收藏

广义质量-视界熵启发的修正引力中的宇宙动力学与结构形成

Cosmological dynamics and structure formation in a generalized mass-to-horizon entropy-inspired modified gravity

The University of Burdwan(巴尔达万大学)

Subhra Mondal, Amitava Choudhuri

AI总结:

本文研究了一种基于广义质量-视界熵关系的修正引力框架中的宇宙动力学和结构形成,探讨了熵对各向同性参数及线性物质扰动增长的影响,并验证了该模型在扁平和非扁平ΛCDM框架下的有效性。

摘要:

本文旨在研究一种受广义质量-视界熵关系启发的修正宇宙学框架中的宇宙动力学和结构形成。通过引入引力-热力学猜想,导致弗里德曼方程和哈勃参数演化的改变。通过在平坦弗里德曼-莱梅特-罗伯特逊-沃克背景中构造扰动场方程,利用球形坍缩形式主义,探讨了广义熵对各种各向同性参数及线性物质扰动增长的影响。我们讨论了一种新颖且广为人知的诊断方法,以区分不同的宇宙学模型,相对于扁平和非扁平ΛCDM框架,发现广义质量-视界熵启发的修正宇宙学(n≠1)通过所有测试,通过否定扁平和非扁平ΛCDM范式。还显示该模型满足宇宙在遥远未来实现热力学平衡的要求。我们还研究了该修正引力场景中的晕质量函数和团块数量计数。所有结果均与基准ΛCDM轮廓进行比较,显示额外的熵修正影响了膨胀历史、结构增长率和坍缩晕的丰度。我们观察到更重的坍缩结构较少且形成于更晚的时期,这符合大尺度结构形成的分层模型。

英文摘要:

In this article, our goal is to investigate the cosmological dynamics and structure formation in a modified cosmological framework inspired by a generalized mass-to-horizon entropy relation and consistent with the Clausius relation. Invoking the gravity-thermodynamics conjecture leads to alterations in the Friedmann equations as well as Hubble parameter evolution. The effects of the generalized entropy on various cosmographic parameters and on the growth of the linear matter perturbations by constructing perturbed field equations via employing spherical collapse formalism in a flat Friedmann-Lemaître-Robertson-Walker background have been explored. We discuss a novel and well-known diagnostic approach to differentiate various cosmological models vis-à-vis flat and non-flat $Λ$CDM frameworks, and find that the generalized mass-to-horizon entropy-inspired modified cosmology ($n\ne 1$) successfully passes all the litmus tests by falsifying both the flat and non-flat $Λ$CDM paradigms. It is shown that this model also satisfies the requirements for the Universe to achieve thermodynamic equilibrium in the distant future. We also study the halo mass function and cluster number counts in this modified gravity scenario. All the results are compared with the fiducial $Λ$CDM profile, showing that the additional entropic correction influences the expansion history, the growth rate of structures, and the abundance of collapsed halos. We observe that the more massive collapsed structures are less abundant and form at later epochs, which is expected from the hierarchical model of large-scale structure formation.}

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑