Accelerating universe in terms of Hankel function index

IF 1.5 4区 物理与天体物理 Q3 ASTRONOMY & ASTROPHYSICS Modern Physics Letters A Pub Date : 2024-01-06 DOI:10.1142/s021773232350178x
K. Suratgar, M. Mohsenzadeh, E. Yusofi, F. Taghizadeh-Farahmand
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Abstract

In this paper, [Formula: see text] cosmology is proposed for the accelerating universe with asymptotic de Sitter expansion in terms of Hankel function index [Formula: see text]. To some extent, both the initial expansion during early inflation and the current accelerated expansion can be studied with a vacuum cosmic fluid, i.e. [Formula: see text] in the pure de Sitter phase. Observational data further support the notion of a quasi-vacuum fluid, rather than a pure vacuum, contributing to the quasi-de Sitter acceleration in both the early and late universe. By examining the asymptotic expansion of the Henkel function as an approximate solution of the Mukhanov–Sasaki equation, we seek a more detailed study of quasi-de Sitter solutions in cosmology containing vacuum-like fluid.
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以汉克尔函数指数表示的加速宇宙
本文从汉克尔函数指数[公式:见正文]的角度提出了渐近德西特膨胀的加速宇宙学[公式:见正文]。在某种程度上,早期膨胀时的初始膨胀和当前的加速膨胀都可以用真空宇宙流体来研究,即[公式:见正文]纯德西特阶段。观测数据进一步支持了准真空流体而非纯真空的概念,准真空流体对早期和晚期宇宙的准德西特加速都有贡献。通过研究作为穆哈诺夫-萨基方程近似解的亨克尔函数的渐近展开,我们寻求对宇宙学中包含类真空流体的准德西特解进行更详细的研究。
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来源期刊
Modern Physics Letters A
Modern Physics Letters A 物理-物理:核物理
CiteScore
3.10
自引率
7.10%
发文量
186
审稿时长
3 months
期刊介绍: This letters journal, launched in 1986, consists of research papers covering current research developments in Gravitation, Cosmology, Astrophysics, Nuclear Physics, Particles and Fields, Accelerator physics, and Quantum Information. A Brief Review section has also been initiated with the purpose of publishing short reports on the latest experimental findings and urgent new theoretical developments.
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