From de Sitter to de Sitter: A Thermal Approach to Running Vacuum Cosmology and the Non-Canonical Scalar Field Description

IF 2.5 4区 物理与天体物理 Q2 ASTRONOMY & ASTROPHYSICS
Universe Pub Date : 2024-09-09 DOI:10.3390/universe10090362
Pedro Eleuterio Mendonça Almeida, Rose Clivia Santos, Jose Ademir Sales Lima
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引用次数: 0

Abstract

The entire classical cosmological history between two extreme de Sitter vacuum solutions is discussed based on Einstein’s equations and non-equilibrium thermodynamics. The initial non-singular de Sitter state is characterised by a very high energy scale, which is equal or smaller than the reduced Planck mass. It is structurally unstable, and all of the continuous created matter, energy, and entropy of the material component comes from the irreversible flow powered by the primeval vacuum energy density. The analytical expression describing the running vacuum is obtained from the thermal approach. It opens a new perspective to solve the old puzzles and current observational challenges plaguing the cosmic concordance model driven by a rigid vacuum. Such a scenario is also modelled through a non-canonical scalar field. It is demonstrated that the resulting scalar field model is shown to be a step-by-step a faithful analytical representation of the thermal running vacuum cosmology.
从德西特到德西特运行真空宇宙学和非正则标量场描述的热学方法
根据爱因斯坦方程和非平衡热力学,讨论了两个极端德西特真空解之间的整个经典宇宙学历史。初始非星状德西特态的特点是能量尺度非常高,等于或小于还原普朗克质量。它在结构上是不稳定的,所有连续产生的物质、能量和物质成分的熵都来自原始真空能量密度驱动的不可逆流动。描述运行真空的分析表达式来自热学方法。它为解决困扰由刚性真空驱动的宇宙和谐模型的旧难题和当前的观测挑战打开了一个新视角。这种情况也通过非经典标量场来模拟。研究表明,由此产生的标量场模型是热运行真空宇宙学的逐步忠实分析表征。
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
Universe
Universe Physics and Astronomy-General Physics and Astronomy
CiteScore
4.30
自引率
17.20%
发文量
562
审稿时长
24.38 days
期刊介绍: Universe (ISSN 2218-1997) is an international peer-reviewed open access journal focused on fundamental principles in physics. It publishes reviews, research papers, communications, conference reports and short notes. Our aim is to encourage scientists to publish their research results in as much detail as possible. There is no restriction on the length of the papers.
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