f（Q,Lm）引力中的修正宇宙学

IF 4.3 2区物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS

Physics Letters B Pub Date : 2025-04-28 DOI:10.1016/j.physletb.2025.139506

Y. Myrzakulov , Alnadhief H.A. Alfedeel , M. Koussour , S. Muminov , E.I. Hassan , J. Rayimbaev

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引用次数: 0

摘要

在这封信中，我们使用非线性模型f(Q,Lm)=−Q+α lmn +β，在修正的f（Q,Lm）引力框架内研究宇宙学，其中α， β和n是自由参数。导出了物质主导宇宙的修正弗里德曼方程，并得到了其解析解。使用哈勃、万神殿+和联合数据集，我们约束了模型参数并检查了它们的含义。结果表明，模型可以适应不同的H0值，这有助于哈勃张力，而n≠1表明偏离广义相对论（GR）。减速参数证实了在zt≈0.6−0.8处向加速度的转变，其当前值支持宇宙加速度。这个模型为基于gr的宇宙学提供了一个可行的替代方案。

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Modified cosmology in f(Q,Lm) gravity

In this letter, we investigate cosmology within the framework of modified

f (Q, L_{m})

gravity using the non-linear model

f (Q, L_{m}) = - Q + α L_{m}^{n} + β

, where α, β, and n are free parameters. The modified Friedmann equations are derived for a matter-dominated universe, and an analytical solution is obtained. Using Hubble, Pantheon+, and joint datasets, we constrain the model parameters and examine their implications. The results indicate that the model accommodates varying

H_{0}

values, contributing to the Hubble tension, while

n \neq 1

suggests deviations from general relativity (GR). The deceleration parameter confirms a transition to acceleration at

z_{t} \approx 0.6 - 0.8

, with present values supporting cosmic acceleration. This model offers a viable alternative to GR-based cosmology.

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来源期刊

Physics Letters B 物理-物理：综合

CiteScore

9.10

自引率

6.80%

发文量

647

审稿时长

3 months

期刊介绍： Physics Letters B ensures the rapid publication of important new results in particle physics, nuclear physics and cosmology. Specialized editors are responsible for contributions in experimental nuclear physics, theoretical nuclear physics, experimental high-energy physics, theoretical high-energy physics, and astrophysics.