Integrated Sachs-Wolfe effect in time varying vacuum model

Integrated Sachs-Wolfe effect in time varying vacuum model
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时变真空模型中的积分萨克斯-沃尔夫效应

DOI:
10.1103/physrevd.81.083514
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发表时间:
2010-04
期刊:
影响因子:
5
通讯作者:
Xu, L. X.
Xu, L. X.
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Lu, J. B.;Wang, Y. T.;Gui, Y. X.;Xu, L. X.

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积分的Sachs-Wolfe(ISW)效应是暗能量的一个重要含义。在本文中,我们计算了时变真空宇宙模型中ISW效应的功率谱,其中模型参数是由增长率的观测约束得到的数学{β}=4.407。结果表明,ISW效应的来源不仅受哈勃函数H(A)和无量纲物质密度的不同演化的影响,而且还受不同的增长函数的影响,这些变化都是由于时变真空模型中物质产生项的存在而引起的。然而,由于从最后一次散射时间到现在的积分,使得数学{\Lambda}(T)\mathm{CDM}模型和数学{\lambda}\mathm{CDM}模型中的ISW效应的差异在一定程度上减小了。这意味着需要对高红移星系的观测来区分这两个模型。
The integrated Sachs-Wolfe (ISW) effect is an important implication for dark energy. In this paper, we have calculated the power spectrum of the ISW effect in the time varying vacuum cosmological model, where the model parameter $\ensuremath{\beta}=4.407$ is obtained by the observational constraint of the growth rate. It is found that the source of the ISW effect is not only affected by the different evolutions of the Hubble function $H(a)$ and the dimensionless matter density ${\ensuremath{\Omega}}_{m}(a)$, but also by the different growth function ${D}_{+}(a)$, all of which are changed due to the presence of a matter production term in the time varying vacuum model. However, the difference of the ISW effect in the $\ensuremath{\Lambda}(t)\mathrm{CDM}$ model and the $\ensuremath{\Lambda}\mathrm{CDM}$ model is lessened to a certain extent because of the integration from the time of last scattering to the present. It is implied that the observations of the galaxies with high redshift are required to distinguish the two models.
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