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arXiv 0801.4517astro-phgr-qchep-ph
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相互作用暗能量模型中的积分Sachs-Wolfe效应

The Integrated Sachs-Wolfe Effect in Interacting Dark Energy Models

German Olivares, Fernando Atrio-Brandela, Diego Pavon

摘要:

宇宙学中提出了暗能量衰变为暗物质的模型来解决符合问题。我们研究了这种耦合对宇宙微波背景温度各向异性的影响。这种相互作用改变了度规势的演化速率、物质密度扰动的增长速率,并改变了宇宙微波背景温度各向异性的积分Sachs-Wolfe分量,增强了这种效应。星系表与CMB图的互相关提供了一个独立于模型的检验来约束相互作用。我们列举了我们的分析一个特定的相互作用模型,并表明星系目录的中值红移$z_m=0.1-0.9$可以排除模型的相互作用参数强度$c^2\simeq 0.1$优于99.95%的置信水平。$c^2\le 0.01$的值与数据是兼容的,并可能占暗能量的分数之间的差异来自WMAP 3年的数据和分数从ISW效应。通过这两种方法测量暗能量的分数可以提供相互作用的证据。

英文摘要:

Models with dark energy decaying into dark matter have been proposed in Cosmology to solve the coincidence problem. We study the effect of such coupling on the cosmic microwave background temperature anisotropies. The interaction changes the rate of evolution of the metric potentials, the growth rate of matter density perturbations and modifies the Integrated Sachs-Wolfe component of cosmic microwave background temperature anisotropies, enhancing the effect. Cross-correlation of galaxy catalogs with CMB maps provides a model independent test to constrain the interaction. We particularize our analysis for a specific interacting model and show that galaxy catalogs with median redshifts $z_m=0.1-0.9$ can rule out models with an interaction parameter strength of $c^2\simeq 0.1$ better than 99.95% confidence level. Values of $c^2\le 0.01$ are compatible with the data and may account for the possible discrepancy between the fraction of dark energy derived from WMAP 3yr data and the fraction obtained from the ISW effect. Measuring the fraction of dark energy by these two methods could provide evidence of an interaction.

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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