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

2023/07/11 by Bragança, Diogo, Donath, Yaniv, Senatore, Leonardo +1 · 2 citations
#Cosmology and Nongalactic Astrophysics (astro-ph.CO) #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #High Energy Physics - Theory (hep-th)

paper · doi:10.48550/arxiv.2307.04992

Abstract

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 12σ (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_NL^loc. to ± 0.26 (3.3), f_NL^eq. to ±16 (92), f_NL^orth. to ± 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.

Cited by

• From Theory to Forecast: Neutrino Mass Effects on Mode-Coupling Kernels and Their Observational Implications
• Equivalence of the field-level inference and conventional analyses on large scales

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