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After the successful full-shape analyses of BOSS data using the EffectiveField Theory of Large-Scale Structure, we investigate what upcoming galaxysurveys might achieve. We introduce a ``perturbativity prior" that ensures thatloop terms are as large as theoretically expected, which is effective in thecase of a large number of EFT parameters. After validating our technique bycomparison with already-performed analyses of BOSS data, we provide Fisherforecasts using the one-loop prediction for power spectrum and bispectrum fortwo benchmark surveys: DESI and MegaMapper. We find overall great improvementson the cosmological parameters. In particular, we find that MegaMapper (DESI)should obtain at least a 12$\sigma$ ($2\sigma$) evidence for non-vanishingneutrino masses, bound the curvature $\Omega_k$ to 0.0012 (0.012), andprimordial 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). Suchmeasurements would provide much insight on the theory of Inflation. Weinvestigate the limiting factor of shot noise and ignorance of the EFTparameters.

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