具有更高非度规性和平方迹的观测约束加速宇宙学模型

IF 12.7 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

ACS Central Science Pub Date : 2023-06-01 DOI:10.1016/j.jheap.2023.04.001

A.S. Agrawal , B. Mishra , S.K. Tripathy

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引用次数: 1

摘要

本文提出了一个在f（Q，T）引力下的宇宙宇宙学模型，其参数受宇宙学数据集的约束。最初，f（Q，T）模型的广义形式被用作f（Q、T）=−λ1Qm−λ2T2，其中λ1、λ2和m是模型参数。通过一些代数运算，哈勃参数是根据红移得到的。然后，使用MCMC分析，使用最新的哈勃和万神殿+数据约束模型参数。模型参数也通过BAO数据集进行了验证。该模型显示了宇宙的早期减速转变为加速阶段。Om（z）诊断指示正斜率，有利于模型处于体模场主导阶段。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Observationally constrained accelerating cosmological model with higher power of non-metricity and squared trace

In this paper, a cosmological model of the Universe is presented in $f (Q, T)$ gravity and the parameters are constrained by cosmological data sets. Initially, a generalised form of $f (Q, T)$ model is used as $f (Q, T) = - λ_{1} Q^{m} - λ_{2} T^{2}$ , where $λ_{1}$ , $λ_{2}$ and m are model parameters. With some algebraic manipulation, the Hubble parameter is obtained in terms of redshift. Then, using MCMC analysis, the model parameters are constrained using the most current Hubble and Pantheon⁺ data. The model parameters are also verified through the BAO data set. The model shows an early deceleration transitioning to an accelerating phase of the Universe. The $O m (z)$ diagnostic indicates a positive slope, favouring the model to be in a phantom field dominated phase.

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来源期刊

ACS Central Science Chemical Engineering-General Chemical Engineering

CiteScore

25.50

自引率

0.50%

发文量

194

审稿时长

10 weeks

期刊介绍： ACS Central Science publishes significant primary reports on research in chemistry and allied fields where chemical approaches are pivotal. As the first fully open-access journal by the American Chemical Society, it covers compelling and important contributions to the broad chemistry and scientific community. "Central science," a term popularized nearly 40 years ago, emphasizes chemistry's central role in connecting physical and life sciences, and fundamental sciences with applied disciplines like medicine and engineering. The journal focuses on exceptional quality articles, addressing advances in fundamental chemistry and interdisciplinary research.