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arXiv 0711.2686astro-phgr-qchep-th
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晚期Lambda(t)宇宙学的观测约束

Observational constraints on late-time Lambda(t) cosmology

S. Carneiro, M. A. Dantas, C. Pigozzo, J. S. Alcaniz

摘要:

宇宙学常数,即,宇宙中所有存在场的真实真空状态中储存的能量密度,是描述当前宇宙加速的最简单和最自然的可能性。然而,尽管它的观测成功,这种可能性加剧了众所周知的宇宙学常数问题,需要一个自然的解释,它的小,但非零,值。在本文中,我们研究了由一个变化的宇宙学项驱动的场景的宇宙学后果,其中真空能量密度随哈勃参数线性衰减。我们测试的可行性,这种情况下,研究一种可能的方法来区分它从目前的标准宇宙模型,使用最近的观察Ia型超新星(超新星遗产调查合作),测量重子声振荡从斯隆数字巡天和位置的宇宙微波背景角谱的第一个峰值从三年威尔金森微波各向异性探测。

英文摘要:

The cosmological constant, i.e., the energy density stored in the true vacuum state of all existing fields in the Universe, is the simplest and the most natural possibility to describe the current cosmic acceleration. However, despite its observational successes, such a possibility exacerbates the well known cosmological constant problem, requiring a natural explanation for its small, but nonzero, value. In this paper we study cosmological consequences of a scenario driven by a varying cosmological term, in which the vacuum energy density decays linearly with the Hubble parameter. We test the viability of this scenario and study a possible way to distinguish it from the current standard cosmological model by using recent observations of type Ia supernova (Supernova Legacy Survey Collaboration), measurements of the baryonic acoustic oscillation from the Sloan Digital Sky Survey and the position of the first peak of the cosmic microwave background angular spectrum from the three-year Wilkinson Microwave Anisotropy Probe.

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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