Papers › Peeking into the next decade in Large-Scale Structure Cosmology with its Effective Field Theory
Peeking into the next decade in Large-Scale Structure Cosmology with its Effective Field Theory
Diogo Bragança, Yaniv Donath, Leonardo Senatore, Henry Zheng
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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 Ωₖ 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.
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