Baryon Asymmetry Constraints on Extended Symmetric Teleparallel Gravity

IF 1.2 4区物理与天体物理 Q3 ASTRONOMY & ASTROPHYSICS Gravitation and Cosmology Pub Date : 2024-05-21 DOI:10.1134/S0202289324700026

S. A. Narawade, S. K. Tripathy, Raghunath Patra, B. Mishra

引用次数: 0

Abstract

We have explored the observed matter-antimatter asymmetry in the Universe to constrain the model parameters in Extended Symmetric Teleparallel Gravity (STG) or \(f(Q,T)\) gravity, where \(Q\) is the nonmetricity and \(T\) is the trace of the energy momentum tensor. We have considered two functional forms of \(f(Q,T)\) to find the baryon asymmetry to entropy ratio calculated at a decoupling temperature. Two different data sets, namely, the Hubble data set and the \(\text{Hubble}+\text{BAO}+\text{Pantheon}\) data set, are used to constrain the scale factor, and the constrained model is used to obtain the baryon asymmetry to entropy ratio. It is observed that the model constrained from the Hubble data set favors a narrow range of the \(f(Q,T)\) gravity parameters to reproduce the observed baryon asymmetry.

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扩展对称远平行引力的重子不对称约束

Abstract We have explored the observed matter-antimatter asymmetry in the Universe to constrain the model parameters in Extended Symmetric Teleparallel Gravity (STG) or \(f(Q,T)\) gravity, where \(Q\) is the nonmetricity and \(T\) is the trace of energy momentum tensor.我们考虑了\(f(Q,T)\)的两种函数形式，以找到在解耦温度下计算出的重子不对称与熵比。我们用两个不同的数据集，即哈勃数据集和（text{Hubble}+text{BAO}+text{Pantheon}）数据集来约束尺度因子，并用约束后的模型得到重子不对称与熵比。结果表明，哈勃数据集约束的模型偏向于在\(f(Q,T)\)引力参数的窄范围内重现观测到的重子不对称性。

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来源期刊

Gravitation and Cosmology ASTRONOMY & ASTROPHYSICS-

CiteScore

1.70

自引率

22.20%

发文量

审稿时长

>12 weeks

期刊介绍： Gravitation and Cosmology is a peer-reviewed periodical, dealing with the full range of topics of gravitational physics and relativistic cosmology and published under the auspices of the Russian Gravitation Society and Peoplesâ€™ Friendship University of Russia. The journal publishes research papers, review articles and brief communications on the following fields: theoretical (classical and quantum) gravitation; relativistic astrophysics and cosmology, exact solutions and modern mathematical methods in gravitation and cosmology, including Lie groups, geometry and topology; unification theories including gravitation; fundamental physical constants and their possible variations; fundamental gravity experiments on Earth and in space; related topics. It also publishes selected old papers which have not lost their topicality but were previously published only in Russian and were not available to the worldwide research community

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