Large-scale inhomogeneity of dark energy produced in the ancestor vacuum

Large-scale inhomogeneity of dark energy produced in the ancestor vacuum
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祖先真空中产生的暗能量的大规模不均匀性

DOI:
10.1103/physrevd.99.103512
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发表时间:
2019
期刊:
影响因子:
5
通讯作者:
Yamauchi
Yamauchi
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Yue Nan; Kazuhiro Yamamoto; Hajime Aoki; Satoshi Iso;; Daisuke;Yamauchi

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我们研究了宇宙中气泡形核情形下暗能量的大尺度不均匀性。在这种情况下,现在的宇宙是由亚稳态原始真空的量子隧穿引起的气泡成核产生的,随后是原始的暴胀时代。在气泡成核过程中,会产生某种标量场的超曲率模式,并保持不变直到出现;因此,如果当前宇宙中标量场的质量足够轻,它们就可以发挥暗能量的作用。超曲率模在一个非常大的空间尺度上波动,比现在宇宙中的哈勃长度长得多。因此,它们产生了暗能量的大尺度不均匀性,并在宇宙微波背景(CMB)波动中产生了大尺度的各向异性。这是这个场景的一个显著特征,其中标量场的量子涨落是暗能量的原因。本文通过积分的Sachs-Wolfe(ISW)效应计算了该方案对CMB各向异性的影响,并给出了曲率参数和描述原始真空某些性质的附加参数的观测约束。
We investigate large-scale inhomogeneity of dark energy in the bubble nucleation scenario of the universe. In this scenario, the present universe was created by a bubble nucleation due to quantum tunneling from a metastable ancestor vacuum, followed by a primordial inflationary era. During the bubble nucleation, supercurvature modes of some kind of a scalar field are produced, and remain until present without decaying; thus they can play a role of the dark energy, if the mass of the scalar field is sufficiently light in the present universe. The supercurvature modes fluctuate at a very large spatial scale, much longer than the Hubble length in the present universe. Thus they create large-scale inhomogeneities of the dark energy, and generate large-scale anisotropies in the cosmic microwave background (CMB) fluctuations. This is a notable feature of this scenario, where quantum fluctuations of a scalar field are responsible for the dark energy. In this paper, we calculate imprints of the scenario on the CMB anisotropies through the integrated Sachs-Wolfe (ISW) effect, and give observational constraints on the curvature parameterand on an additional parameterdescribing some properties of the ancestor vacuum.
暗能量各向异性的约束
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