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北美退伍军人节(Veterans Day),12 日无更新
arXiv 1208.6505astro-ph.COgr-qc
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暗能量、物质生成和曲率

Dark energy, matter creation and curvature

Victor H. Cardenas

摘要:

解释当前宇宙加速膨胀的最常用方法是假设存在暗能量;一种新的成分充满了宇宙,不会聚集,目前主导着演化,并且具有负压。在这项工作中,我研究了利马等人提出的另一种模型。\cite{lima96},它不需要一个奇异的状态方程,而是假设存在引力粒子的创建。因为这个模型适合超新星观测以及$Λ$ CDM模型,我在这项工作中进行了深入的研究,考虑到一个明确的空间曲率的模型。我发现,在这种情况下,我们可以缓解宇宙巧合的问题,基本上表明,这两个组成部分,暗物质和暗能量,是相同的性质,但他们的行为在不同的尺度。本文还指出了一些粒子产生模型的不足,并研究了一个克服这些困难的新模型。

英文摘要:

The most studied way to explain the current accelerated expansion of the universe is to assume the existence of dark energy; a new component that fill the universe, does not clumps, currently dominates the evolution, and has a negative pressure. In this work I study an alternative model proposed by Lima et al. \cite{lima96}, which does not need an exotic equation of state, but assumes instead the existence of gravitational particle creation. Because this model fits the supernova observations as well as the $Λ$CDM model, I perform in this work a thorough study of this model considering an explicit spatial curvature. I found that in this scenario we can alleviate the cosmic coincidence problem, basically showing that these two components, dark matter and dark energy, are of the same nature, but they act at different scales. I also shown the inadequacy of some particle creation models, and also I study a previously propose new model that overcome these difficulties.

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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