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arXiv 1306.6758gr-qc
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来自几何热力学的暗能量

Dark energy from Geometrothermodynamics

INFN Sez. di Napoli(意大利国家核物理研究院那不勒斯分部)

Alessandro Bravetti, Orlando Luongo

AI总结:

本文利用几何热力学推导出一种能自然重现暗能量效应的流体模型,在小红移下退化为ΛCDM模型,并随宇宙膨胀产生显著偏离,从而为宇宙加速膨胀提供几何与热力学相互作用的新解释。

摘要:

几何热力学是一种将热力学与接触几何和黎曼几何相结合的理论。本文利用几何热力学形式体系推断能够预言所观测到的宇宙加速膨胀的宇宙学模型。作为一个重要结果,我们的简单模型显示出似乎能够较好描述晚期宇宙动力学的动力学性质。为此,我们利用关于常热力学曲率的几何考虑,推导出一种流体模型,该流体被期望能够“自然地”重现暗能量效应。特别地,在小红移极限情形下,我们的方法退化为ΛCDM模型,但随着宇宙膨胀,会给出与ΛCDM模型的显著偏离。主要目标在于将我们的“几何热力学流体”解释为一种能量源,并将暗能量效应解释为几何与热力学相互作用的结果,从而为所观测到的正加速现象提供一种新的解释。

英文摘要:

Geometrothermodynamics is a geometric theory which combines thermodynamics with contact and Riemannian geometry. In this work we use the formalism of geometrothermodynamics to infer cosmological models which predict the observed speed up. As a relevant consequence, our simple model shows dynamical properties which seem to fairly well describe the late time universe dynamics. To do so, we use geometric considerations about constant thermodynamic curvature and derive the model of a fluid which is expected to \emph{naturally} reproduce the dark energy effects. In particular, our approach reduces to the $Λ$CDM model in the limiting case of small redshift, providing however significative departures from $Λ$CDM as the universe expands. The main goal consists in interpreting our \emph{geometrothermodynamic fluid} as an energetic source and to explain the dark energy effects as emerging from the interplay between geometry and thermodynamics, providing a new interpretation of the observed positive acceleration.

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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