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arXiv 1406.7722astro-ph.COhep-th
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用Planck数据重新讨论(伪)共形宇宙的约束

Revisiting constraints on (pseudo)conformal Universe with Planck data

G. I. Rubtsov, S. R. Ramazanov

摘要:

我们重新审视约束(伪)共形宇宙从非观测的统计各向异性的普朗克数据。二次最大似然估计适用于普朗克温度图在频率143 GHz和217 GHz以及它们的互相关。最强的约束是在共形对称性破缺后经历长期中间演化的(伪)共形宇宙的情况下获得的。根据相关参数(耦合常数),在95% C. L.时,极限为h^2 <0.0013。(使用交叉估计器)。在没有中间级的情况下(h^2 \ln \frac{H_0} Λ<0.52),允许耦合常数为一阶,类似的限制弱得多。在后一种情况下,4点函数中的非高斯性似乎是更有希望的签名。

英文摘要:

We revisit constraints on the (pseudo)conformal Universe from the non-observation of statistical anisotropy in the Planck data. The quadratic maximal likelihood estimator is applied to the Planck temperature maps at frequencies 143 GHz and 217 GHz as well as their cross-correlation. The strongest constraint is obtained in the scenario of the (pseudo)conformal Universe with a long intermediate evolution after conformal symmetry breaking. In terms of the relevant parameter (coupling constant), the limit is h^2 <0.0013 at 95% C.L. (using the cross-estimator). The analogous limit is much weaker in the scenario without the intermediate stage (h^2 \ln \frac{H_0}Λ<0.52) allowing the coupling constant to be of order one. In the latter case, the non-Gaussianity in the 4-point function appears to be a more promising signature.

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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