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arXiv 1801.02773astro-ph.CO
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PLANCK CMB数据中各向异性功率谱和观测到的低-l功率

Anisotropic power spectrum and the observed low-l power in PLANCK CMB data

Zhe Chang, Pranati K. Rath, Yu Sang, Dong Zhao

摘要:

在这项工作中,我们研究了各向异性Finsler时空中的方向相关功率谱。我们使用这个方向相关的功率谱来解决WMAP和普朗克数据中观察到的低l功率。温度波动的角功率谱在多极范围l = 2-40中具有比$Λ$ CDM模型更低的幅度。我们的理论模型给出了一个修正各向同性的角功率谱$C^{TT}_l$由于打破了旋转不变性的原始功率谱。我们估计最佳拟合模型参数以及六个$Λ$ CDM宇宙学参数,使用CosmoMC软件中的普朗克似然代码。我们看到,这种修改后的角功率谱拟合CMB温度数据在多极范围l=2-10到一个很好的程度,但失败的整个多极范围l = 2-40。

英文摘要:

In this work, we study a direction dependent power spectrum in anisotropic Finsler space-time. We use this direction dependent power spectrum to address the low-l power observed in WMAP and PLANCK data. The angular power spectrum of the temperature fluctuations has a lower amplitude in comparison to the $Λ$CDM model in the multipole range l = 2-40. Our theoretical model gives a correction to the isotropic angular power spectrum $C^{TT}_l$ due to the breaking of the rotational invariance of the primordial power spectrum. We estimate best-fit model parameters along with the six $Λ$CDM cosmological parameters using PLANCK likelihood code in CosmoMC software. We see that this modified angular power spectrum fits the CMB temperature data in the multipole range l=2-10 to a good extent but fails for the whole multipole range l = 2-40.

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