哈勃参量限制宇宙的backreaction效应

发布时间：2018-03-14 06:14

本文选题：暗能量　切入点：backreaction　出处：《北京师范大学学报(自然科学版)》2017年02期 　论文类型：期刊论文

【摘要】：主要研究不均匀宇宙下的平均宇宙模型对宇宙加速膨胀的解释.首先,通过对该尘埃宇宙模型下的backreaction效应和Larena等提出的模板度规结合,得出了如下结论:FLRW度规对早期宇宙的演化能进行准确描述,但到晚期大约aD0.1之后与backreaction模型区别明显.其次,选择通过有效哈勃参量来限制宇宙学参量.由于不能得到准确的尺度因子和红移关系,于是近似选择FLRW度规代替模板度规进行限制.限制结果发现Ωm=0.25+0.02-0.02(1σstat),与其他观测如超新星遗迹探测(SNLS)和Ⅰa型超新星等符合的很好.最后,通过限制结果的最佳拟合值对此模型下的宇宙学参量进行了分析,表明宇宙的backreaction效应可以很好解释宇宙加速膨胀,因此值得对此模型进行进一步的研究.
[Abstract]:This paper mainly studies the explanation of the accelerating expansion of the universe by the average cosmic model under the inhomogeneous universe. Firstly, by combining the backreaction effect in the dust universe model with the template metric proposed by Larena and so on, The following conclusions are drawn: the evolution of the early universe can be accurately described by the: FLRW metric, but it is distinct from the backreaction model after the late aD0.1. Choosing to limit cosmological parameters by using effective Hubble parameters. The exact scaling factor and redshift relation can not be obtained. Therefore, the FLRW metric is approximately chosen instead of the template metric to be limited. It is found that 惟 m0. 25 0. 02-0. 02 0. 02 蟽 stats agree well with other observations such as supernova remnant detection (SNLS) and type I a supernova. Finally, The cosmological parameters under this model are analyzed by the best fitting value of the limited results. It is shown that the backreaction effect of the universe can explain the accelerating expansion of the universe well, so it is worthy of further study on this model.
【作者单位】：北京师范大学天文学系;
【基金】：国家自然科学基金资助项目(11573006,11528306,10473002) 科技部973资助项目(2012CB821804)
【分类号】：P159

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