论文标题

Quijote PNG:光环功率谱和双光谱的信息内容

Quijote PNG: The information content of the halo power spectrum and bispectrum

论文作者

Coulton, William R, Villaescusa-Navarro, Francisco, Jamieson, Drew, Baldi, Marco, Jung, Gabriel, Karagiannis, Dionysios, Liguori, Michele, Verde, Licia, Wandelt, Benjamin D.

论文摘要

我们研究了从光晕场的小规模测量值中,可以从四种类型的原始非高斯(PNG)中学到多少。使用Quijote-PNG模拟,我们通过测量光谱频谱单极和四极杆,物质功率谱,卤代 - 音马元横谱和晕圈双启光谱单极量化了可访问的信息内容。该分析是第一个包含小型非线性尺度的分析,最多$ k_ \ mathrm {max} = 0.5 \ mathrm {h/mpc} $,并探索这些量表是否可以与宇宙学和nuisance参数破坏脱发,从而利用数千个n-body模拟。我们在红移空间中执行所有光晕测量,其中一个样本由所有halos组成,其中包括质量$> 3.2 \ times 10^{13} 〜h^{ - 1} m_ \ odot $。对于局部PNG,使用样本方差取消对功率谱的量表依赖性偏差效应的测量比Halo Bispectrum的测量值明显更严格。在这种情况下,小尺度的测量增加了最小的额外约束功率。相比之下,关于等边和正交性PNG的信息主要通过双光谱访问。对于这些形状,小型测量值将Halo Bispectrum的约束功率提高到$ \ times4 $,尽管添加量表超过$ k \ of $ k \约0.3 \ mathrm {h/mpc} $可改善约束,从而通过减少PNG和其他参数之间的变色来改善约束。通过结合功率谱和双光谱测量,这些脱位更加有力地减轻。但是,即使有了结合的测量和小规模的信息,与$σ_8$和我们的偏置模型的等边非高斯性仍然高度退化。

We investigate how much can be learnt about four types of primordial non-Gaussianity (PNG) from small-scale measurements of the halo field. Using the QUIJOTE-PNG simulations, we quantify the information content accessible with measurements of the halo power spectrum monopole and quadrupole, the matter power spectrum, the halo-matter cross spectrum and the halo bispectrum monopole. This analysis is the first to include small, non-linear scales, up to $k_\mathrm{max}=0.5 \mathrm{h/Mpc}$, and to explore whether these scales can break degeneracies with cosmological and nuisance parameters making use of thousands of N-body simulations. We perform all the halo measurements in redshift space with a single sample comprised of all halos with mass $>3.2 \times 10^{13}~h^{-1}M_\odot$. For local PNG, measurements of the scale dependent bias effect from the power spectrum using sample variance cancellation provide significantly tighter constraints than measurements of the halo bispectrum. In this case measurements of the small scales add minimal additional constraining power. In contrast, the information on equilateral and orthogonal PNG is primarily accessible through the bispectrum. For these shapes, small scale measurements increase the constraining power of the halo bispectrum by up to $\times4$, though the addition of scales beyond $k\approx 0.3 \mathrm{h/Mpc}$ improves constraints largely through reducing degeneracies between PNG and the other parameters. These degeneracies are even more powerfully mitigated through combining power spectrum and bispectrum measurements. However even with combined measurements and small scale information, equilateral non-Gaussianity remains highly degenerate with $σ_8$ and our bias model.

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