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arXiv 2307.04992astro-ph.COhep-phhep-th
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用大尺度结构的有效场论展望未来十年的大尺度结构宇宙学

Peeking into the next decade in Large-Scale Structure Cosmology with its Effective Field Theory

Diogo Bragança, Yaniv Donath, Leonardo Senatore, Henry Zheng

AI总结:

本文将 EFT 全形状分析与“微扰性先验”应用于 DESI 和 MegaMapper,预测其在中微子质量、曲率及原初非高斯性等参数上的显著提升。

摘要:

在利用大尺度结构有效场论(Effective Field Theory of Large-Scale Structure)对 BOSS 数据成功开展全形状分析之后,我们研究了即将进行的星系巡天可能取得的成果。我们引入了一种“微扰性先验”,用于确保圈图项达到理论预期的大小;在存在大量 EFT 参数的情况下,这一先验非常有效。在通过与已经完成的 BOSS 数据分析进行比较来验证我们的技术之后,我们针对两个基准巡天——DESI 和 MegaMapper——使用功率谱与双谱的单圈预测给出了 Fisher 预测。我们发现宇宙学参数总体上会获得巨大改进。特别是,我们发现 MegaMapper(DESI)应当至少获得 12σ(2σ)的非零中微子质量证据,将曲率 Ω_k 限制到 0.0012(0.012),并将原初暴胀非高斯性限制如下:f_NL^loc. 达到 ±0.26(3.3),f_NL^eq. 达到 ±16(92),f_NL^orth. 达到 ±4.2(27)。此类测量将为暴胀理论提供大量洞见。我们还研究了散粒噪声以及对 EFT 参数缺乏了解这一限制因素。

英文摘要:

After the successful full-shape analyses of BOSS data using the Effective Field Theory of Large-Scale Structure, we investigate what upcoming galaxy surveys might achieve. We introduce a ``perturbativity prior" that ensures that loop terms are as large as theoretically expected, which is effective in the case of a large number of EFT parameters. After validating our technique by comparison with already-performed analyses of BOSS data, we provide Fisher forecasts using the one-loop prediction for power spectrum and bispectrum for two benchmark surveys: DESI and MegaMapper. We find overall great improvements on the cosmological parameters. In particular, we find that MegaMapper (DESI) should obtain at least a 12$σ$ ($2σ$) evidence for non-vanishing neutrino masses, bound the curvature $Ω_k$ to 0.0012 (0.012), and primordial inflationary non-Gaussianities as follows: $f_{\text{NL}}^{\text{loc.}}$ to $\pm 0.26$ (3.3), $f_{\text{NL}}^{\text{eq.}}$ to $\pm16$ (92), $f_{\text{NL}}^{\text{orth.}}$ to $\pm 4.2$ (27). Such measurements would provide much insight on the theory of Inflation. We investigate the limiting factor of shot noise and ignorance of the EFT parameters.

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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