Thermal evolution and stability analysis of phenomenologically emergent dark energy model

IF 4.2 2区物理与天体物理 Q2 PHYSICS, PARTICLES & FIELDS

The European Physical Journal C Pub Date : 2023-08-06 DOI:10.1140/epjc/s10052-023-11840-0

Rosemin John, N. Sarath, Titus K. Mathew

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Abstract

The phenomenologically emergent dark energy (PEDE) model is a varying dark energy model with no extra degrees of freedom proposed by Li and Shafieloo (Astrophys J 883(1):L3, 2019) to alleviate the Hubble tension. The statistical consistency of the model has been discussed by many authors. Since the model depicts a phantom dark energy that increases with redshift, its cosmic evolution, particularly during the late phase, must be examined. We discover that the model’s Hubble and deceleration parameters display unusual behaviour in the future, which differs from \(\varLambda \)CDM cosmology. We find the model also follows a distinct evolution in the statefinder plane. The phantom nature of the model leads to the violation of the null energy condition and a decrease in horizon entropy. The asymptotic future epoch also seems to be unstable based on our dynamical system analysis as well as the stability analysis based on dark energy sound speed.

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现象学涌现暗能量模型的热演化与稳定性分析

现象学涌现暗能量(PEDE)模型是Li和Shafieloo (Astrophys J 883(1):L3, 2019)为缓解哈勃张力而提出的无额外自由度的变化暗能量模型。该模型的统计一致性已被许多作者讨论过。由于该模型描绘了一个随着红移而增加的暗能量幻影，因此必须对其宇宙演化，特别是在后期阶段进行研究。我们发现该模型的哈勃和减速参数在未来表现出不同寻常的行为，这与\(\varLambda \) CDM宇宙学不同。我们发现该模型在寻态器平面上也遵循一个明显的演变。模型的幻像性质导致了零能条件的破坏和视界熵的减小。基于我们的动力系统分析和基于暗能量声速的稳定性分析，渐近的未来历元似乎也是不稳定的。

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

The European Physical Journal C 物理-物理：粒子与场物理

CiteScore

8.10

自引率

15.90%

发文量

1008

审稿时长

2-4 weeks

期刊介绍： Experimental Physics I: Accelerator Based High-Energy Physics Hadron and lepton collider physics Lepton-nucleon scattering High-energy nuclear reactions Standard model precision tests Search for new physics beyond the standard model Heavy flavour physics Neutrino properties Particle detector developments Computational methods and analysis tools Experimental Physics II: Astroparticle Physics Dark matter searches High-energy cosmic rays Double beta decay Long baseline neutrino experiments Neutrino astronomy Axions and other weakly interacting light particles Gravitational waves and observational cosmology Particle detector developments Computational methods and analysis tools Theoretical Physics I: Phenomenology of the Standard Model and Beyond Electroweak interactions Quantum chromo dynamics Heavy quark physics and quark flavour mixing Neutrino physics Phenomenology of astro- and cosmoparticle physics Meson spectroscopy and non-perturbative QCD Low-energy effective field theories Lattice field theory High temperature QCD and heavy ion physics Phenomenology of supersymmetric extensions of the SM Phenomenology of non-supersymmetric extensions of the SM Model building and alternative models of electroweak symmetry breaking Flavour physics beyond the SM Computational algorithms and tools...etc.