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arXiv 1909.07951astro-ph.COgr-qchep-phhep-th
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大尺度结构有效场论SDSS/BOSS数据的有效宇宙学分析

Efficient Cosmological Analysis of the SDSS/BOSS data from the Effective Field Theory of Large-Scale Structure

Thomas Colas, Guido D'Amico, Leonardo Senatore, Pierre Zhang, Florian Beutler

摘要:

精确的宇宙学数据使我们能够准确地近似预测的宇宙学观测值的泰勒扩展到一个低阶的宇宙学参数的依赖性周围的参考宇宙学。将这一观测结果应用于大尺度结构的有效场论的红移空间单圈星系功率谱,通过扫描包含大量中微子的$Λ$ CDM宇宙学的所有参数,对BOSS DR 12数据进行了分析。我们施加了几套先验,其中最广泛的只是一个大爆炸核合成之前的重子,$Ω_b h^2$,当前的分数能量密度和中微子质量的总和是小于0.9 eV的约束。在这种情况下,我们测量原始振幅的功率谱,$A_s$,丰富的物质,$Ω_m$,哈勃参数,$H_0$,和倾斜的原始功率谱,$n_s$,约$19\%$,$5.7\%$,$2.2\%$和$7.3\%$分别,获得$\ln ( 10^{10} A_s) =2.91\pm 0.19$,$Ω_m=0.314\pm 0.018$,$H_0=68.7\pm 1.5$ km/(s Mpc)和$n_s=0.979\pm 0.071$在$68\%$置信水平。公共代码随本预印本一起发布。

英文摘要:

The precision of the cosmological data allows us to accurately approximate the predictions for cosmological observables by Taylor expanding up to a low order the dependence on the cosmological parameters around a reference cosmology. By applying this observation to the redshift-space one-loop galaxy power spectrum of the Effective Field Theory of Large-Scale Structure, we analyze the BOSS DR12 data by scanning over all the parameters of $Λ$CDM cosmology with massive neutrinos. We impose several sets of priors, the widest of which is just a Big Bang Nucleosynthesis prior on the current fractional energy density of baryons, $Ω_b h^2$, and a bound on the sum of neutrino masses to be less than 0.9 eV. In this case we measure the primordial amplitude of the power spectrum, $A_s$, the abundance of matter, $Ω_m$, the Hubble parameter, $H_0$, and the tilt of the primordial power spectrum, $n_s$, to about $19\%$, $5.7\%$, $2.2\%$ and $7.3\%$ respectively, obtaining $\ln ( 10^{10} A_s) =2.91\pm 0.19$, $Ω_m=0.314\pm 0.018$, $H_0=68.7\pm 1.5$ km/(s Mpc) and $n_s=0.979\pm 0.071$ at $68\%$ confidence level. A public code is released with this preprint.

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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