Exploring Universe acceleration through observational constraints via Hubble parameter reconstruction

IF 10.2 4区物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS Journal of High Energy Astrophysics Pub Date : 2024-04-10 DOI:10.1016/j.jheap.2024.04.003

M. Koussour , N. Myrzakulov , M.K.M. Ali

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Abstract

In this article, we introduce an innovative parametric representation of the Hubble parameter, providing a model-independent means to explore the dynamics of an accelerating cosmos. The model's parameters are rigorously constrained through a Markov Chain Monte Carlo (MCMC) approach, leveraging a comprehensive dataset consisting of 31 data points from cosmic chronometers (CC), 1701 updated observations of Pantheon supernovae type Ia (SNeIa), and 6 data points from baryonic acoustic oscillations (BAO). Our analysis delves into the behavior of various cosmological parameters within the model, including the transition from a decelerating phase to an accelerating one, as well as the density parameters and the equation of state (EoS) parameter. The outcomes of our investigation reveal that the equation of state parameter aligns with characteristics reminiscent of the phantom model, supporting the prevailing understanding of our universe's current state of acceleration. This research contributes valuable insights into the ongoing cosmic expansion and underscores the utility of our novel parametric approach.

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通过哈勃参数重构的观测约束探索宇宙加速度

在这篇文章中，我们介绍了哈勃参数的创新参数表示法，为探索加速宇宙的动力学提供了一种与模型无关的方法。该模型的参数是通过马尔可夫链蒙特卡罗（MCMC）方法严格约束的，并利用了一个综合数据集，其中包括来自宇宙计时器（CC）的 31 个数据点、1701 个更新的 Ia 型潘神超新星（SNeIa）观测数据，以及来自重子声振荡（BAO）的 6 个数据点。我们的分析深入研究了模型中各种宇宙学参数的行为，包括从减速阶段到加速阶段的过渡，以及密度参数和状态方程（EoS）参数。我们的研究结果表明，状态方程参数与幻影模型的特征相吻合，支持了对我们宇宙当前加速状态的普遍理解。这项研究为我们深入了解正在进行的宇宙膨胀做出了宝贵的贡献，并强调了我们新颖的参数方法的实用性。

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来源期刊

Journal of High Energy Astrophysics Earth and Planetary Sciences-Space and Planetary Science

CiteScore

9.70

自引率

5.30%

发文量

审稿时长

65 days

期刊介绍： The journal welcomes manuscripts on theoretical models, simulations, and observations of highly energetic astrophysical objects both in our Galaxy and beyond. Among those, black holes at all scales, neutron stars, pulsars and their nebula, binaries, novae and supernovae, their remnants, active galaxies, and clusters are just a few examples. The journal will consider research across the whole electromagnetic spectrum, as well as research using various messengers, such as gravitational waves or neutrinos. Effects of high-energy phenomena on cosmology and star-formation, results from dedicated surveys expanding the knowledge of extreme environments, and astrophysical implications of dark matter are also welcomed topics.