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arXiv 2407.02429gr-qc
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无暴胀子场的暴胀热力学模型

A thermodynamic model of inflation without inflaton field

Jesus Anaya-Galeana, Orlando Luongo, Hernando Quevedo

AI总结:

本文在几何热力学框架下提出一种无需暴胀子场的暴胀宇宙流体模型,通过引入具有压强成分的额外真实流体解释平坦性与视界问题,并计算温度、粒子产生及再加热等性质,进而联系晚期加速与暴胀。

摘要:

在几何热力学框架下,我们探索如何在不引入暴胀子场的情况下构造暴胀宇宙流体。为此,我们采用标准辐射和物质作为正压背景,并推测存在另一种真实流体,将其解释为可能具有压强成分的物质。我们由此阐述其主要特征,展示它如何可能应对平坦性问题和视界问题,产生与理论预期相符的等效e-foldings数目。此外,我们计算了相应的平衡温度和动力学温度,并以粒子产生和有效再加热机制的形式计算了非平衡性质。据此,我们重新审视暴胀如何结束,以及如何从观测中确定模型的自由参数。最后但同样重要的是,我们提出如何获得一个裸宇宙学常数,从而将晚期加速与暴胀联系起来,旨在统一这两种方法。最后,我们讨论了与依赖标量场势的标准方法相比,我们的处理方式所对应的理论含义,并强调其主要优缺点。

英文摘要:

In the framework of geometrothermodynamics, we explore how to construct an inflationary cosmic fluid without requiring inflaton fields. To do so, we employ standard radiation and matter as barotropic background, speculating on the existence of a further real fluid, interpreted as a possible matter with pressure constituent. We thus illustrate its main characteristics, showing how it may face the flatness and horizon problems, yielding an equivalent number of e-foldings, compatible with theoretical expectations. Moreover, we calculate the associated equilibrium and kinetic temperatures, and compute out-of-equilibrium properties, in terms of particle production and effective reheating mechanism. Accordingly, we revise how inflation ends and how to fix the free parameters of our model from observations. Last but not least, we propose how to obtain a bare cosmological constant that could relate the late-time acceleration to inflation, aiming to unify the two approaches. Finally, we discuss the corresponding theoretical implications of our treatment in contrast to the standard approach reliant on scalar field potentials, emphasizing the main advantages and disadvantages.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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