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The precision of the cosmological data allows us to accurately approximatethe predictions for cosmological observables by Taylor expanding up to a loworder the dependence on the cosmological parameters around a referencecosmology. By applying this observation to the redshift-space one-loop galaxypower spectrum of the Effective Field Theory of Large-Scale Structure, weanalyze the BOSS DR12 data by scanning over all the parameters of $\Lambda$CDMcosmology with massive neutrinos. We impose several sets of priors, the widestof which is just a Big Bang Nucleosynthesis prior on the current fractionalenergy density of baryons, $\Omega_b h^2$, and a bound on the sum of neutrinomasses to be less than 0.9 eV. In this case we measure the primordial amplitudeof the power spectrum, $A_s$, the abundance of matter, $\Omega_m$, the Hubbleparameter, $H_0$, and the tilt of the primordial power spectrum, $n_s$, toabout $19\%$, $5.7\%$, $2.2\%$ and $7.3\%$ respectively, obtaining $\ln (10^{10} A_s) =2.91\pm 0.19$, $\Omega_m=0.314\pm 0.018$, $H_0=68.7\pm 1.5$ km/(sMpc) and $n_s=0.979\pm 0.071$ at $68\%$ confidence level. A public code isreleased with this preprint.

Efficient Cosmological Analysis of the SDSS/BOSS data from the Effective Field Theory of Large-Scale Structure