The Early and Late Universe in the Modified Einstein-Maxwell-Gauss-Bonnet Model

IF 1.3 4区物理与天体物理 Q3 PHYSICS, MULTIDISCIPLINARY

International Journal of Theoretical Physics Pub Date : 2025-03-20 DOI:10.1007/s10773-025-05953-3

Pyotr Tsyba, Dauren Rakhatov, Olga Razina

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引用次数: 0

Abstract

This work is aimed at creating and verifying the viability of the Einstein-Gauss-Bonnet model with modifications in the form of the scalar fields and the electromagnetic field. The initial viability analysis of the model confirmed the compliance of the solutions with modern cosmological data. Due to the use of hybrid solutions, the model is universal and can consider a wide range of cases. In this way, it was possible to achieve simultaneous compliance with the conditions of slow-roll and chaotic inflation. The slow-roll parameters meet the requirements of the beginning and duration of inflation. The model fully corresponds to the red tilt of the spectral index \(n_S\) and corresponds to the Planck 2018 data. The propagation speed of scalar perturbations (\(c_A\)) and gravitational waves (\(c_T\)) coincide with the speed of light. Subsequently, an examination of the post-inflationary phase was conducted. The stability of the model is justified by the propagation speed of baryon oscillations. The presence of a transition from decelerated to accelerated expansion was found at the redshift \(z\approx 0.66\). The application of the described methods has shown that the model is stable, viable, and can be used to study the early and late stages of the Universe.

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这项工作旨在建立和验证爱因斯坦-高斯-波奈模型的可行性，并对标量场和电磁场的形式进行了修改。对模型的初步可行性分析证实，其解决方案符合现代宇宙学数据。由于使用了混合解，该模型具有通用性，可以考虑多种情况。这样，就有可能同时符合慢滚和混沌膨胀的条件。慢滚参数符合膨胀开始和持续时间的要求。该模型完全符合光谱指数（n_S/）的红色倾斜，并与普朗克2018年的数据相对应。标量扰动（\(c_A\)）和引力波（\(c_T\)）的传播速度与光速重合。随后，对胀大后阶段进行了研究。重子振荡的传播速度证明了模型的稳定性。在红移（z大约0.66）处发现了从减速膨胀到加速膨胀的过渡。所述方法的应用表明，该模型是稳定的、可行的，可用于研究宇宙的早期和晚期阶段。

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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来源期刊

International Journal of Theoretical Physics 物理-物理：综合

CiteScore

2.50

自引率

21.40%

发文量

258

审稿时长

3.3 months

期刊介绍： International Journal of Theoretical Physics publishes original research and reviews in theoretical physics and neighboring fields. Dedicated to the unification of the latest physics research, this journal seeks to map the direction of future research by original work in traditional physics like general relativity, quantum theory with relativistic quantum field theory,as used in particle physics, and by fresh inquiry into quantum measurement theory, and other similarly fundamental areas, e.g. quantum geometry and quantum logic, etc.