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arXiv 1712.04041gr-qcastro-ph.CO
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引力熵与宇宙学无毛猜想

Gravitational entropy and the cosmological no-hair conjecture

Krzysztof Bolejko

摘要:

引力熵和无毛理论似乎预测了我们宇宙相互矛盾的未来状态。引力熵的增长与不均匀性的增长有关,而无毛猜想认为,由暗能量主导的宇宙应该渐近地接近均匀和各向同性的德西特态。本文的目的就是研究这两种结构。这项研究是基于Simsilun模拟,它使用沉默宇宙的近似来模拟宇宙。寂静宇宙是爱因斯坦方程的一个解,它假设尘埃是无旋、无粘性和绝缘的,外尔曲率的磁性部分消失。Simsilun模拟的初始条件来源于Millennium模拟,其结果是一个现实的,但相对论性的宇宙起源模拟。Simsilun模拟从早期宇宙(t = 2500万年)到遥远的未来(t = 1000 Gyr)。调查结果表明,这两种假设都是正确的。在全球尺度上,一个具有正的宇宙学常数和非正的空间曲率的宇宙确实接近德西特态。与此同时,它不断产生引力熵。

英文摘要:

The gravitational entropy and no-hair conjectures seems to predict contradictory future states of our Universe. The growth of the gravitational entropy is associated with the growth of inhomogeneity, while the no-hair conjecture argues that a universe dominated by dark energy should asymptotically approach a homogeneous and isotropic de Sitter state. The aim of this paper is to study these two conjectures. The investigation is based on the Simsilun simulation, which simulates the universe using the approximation of the Silent Universe. The Silent Universe is a solution to the Einstein equations that assumes irrotational, non-viscous, and insulated dust, with vanishing magnetic part of the Weyl curvature. The initial conditions for the Simsilun simulation are sourced from the Millennium simulation, which results with a realistically appearing but relativistic at origin simulation of a universe. The Simsilun simulation is evolved from the early universe (t = 25 Myr) till far future (t = 1000 Gyr). The results of this investigation show that both conjectures are correct. On global scales, a universe with a positive cosmological constant and non-positive spatial curvature does indeed approach the de Sitter state. At the same time it keeps generating the gravitational entropy.

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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