Anisotropies of diffusive ultra-high energy cosmic rays in f(R) gravity theory

IF 4.2 3区 物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS
Swaraj Pratim Sarmah, Umananda Dev Goswami
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Abstract

Understanding the anisotropy of ultra high-energy cosmic rays (UHECRs) is crucial for unravelling the origins and propagation mechanisms of these enigmatic particles. In this work, we studied the dipolar anisotropy of UHECRs in the diffusive regime by considering three cosmological models: the standard ΛCDM model, f(R) gravity power-law model and the Starobinsky model. This work aims to see the role of the f(R) gravity theory in understanding the anisotropy of UHECRs without condoning the standard cosmology. We found that the amplitude of the dipolar anisotropy is sensitive to these cosmological models, with the f(R) power-law model predicting the largest amplitude, while the ΛCDM model predicting the smallest amplitude at most of the energies in the range considered. The predicted amplitude of the Starobinsky model lies within the range of the ΛCDM one. This work not only provides a way for exploration of UHECRs anisotropy within different cosmological contexts but also may pave the way for new avenues of research at the intersection of high-energy astrophysics.

f(R)引力理论中扩散超高能宇宙射线的各向异性
了解超高能宇宙射线(UHECRs)的各向异性对于揭示这些神秘粒子的起源和传播机制至关重要。在这项工作中,我们通过考虑三种宇宙学模型:标准ΛCDM模型、f(R)引力幂律模型和斯塔罗宾斯基模型,研究了超高能宇宙射线在扩散机制下的偶极各向异性。这项工作旨在了解 f(R)引力理论在理解 UHECRs 各向异性方面的作用,而不姑息标准宇宙学。我们发现偶极各向异性的振幅对这些宇宙学模型很敏感,f(R)幂律模型预测的振幅最大,而ΛCDM模型预测的振幅在考虑范围内的大多数能量下最小。斯塔罗宾斯基模型预测的振幅在 ΛCDM 模型的范围之内。这项工作不仅为探索 UHECRs 在不同宇宙学背景下的各向异性提供了一种方法,而且可能为高能天体物理学交叉研究的新途径铺平道路。
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
Astroparticle Physics
Astroparticle Physics 地学天文-天文与天体物理
CiteScore
8.00
自引率
2.90%
发文量
41
审稿时长
79 days
期刊介绍: Astroparticle Physics publishes experimental and theoretical research papers in the interacting fields of Cosmic Ray Physics, Astronomy and Astrophysics, Cosmology and Particle Physics focusing on new developments in the following areas: High-energy cosmic-ray physics and astrophysics; Particle cosmology; Particle astrophysics; Related astrophysics: supernova, AGN, cosmic abundances, dark matter etc.; Gravitational waves; High-energy, VHE and UHE gamma-ray astronomy; High- and low-energy neutrino astronomy; Instrumentation and detector developments related to the above-mentioned fields.
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