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We present a re-analysis of cosmic shear and galaxy clustering fromfirst-year Dark Energy Survey data (DES Y1), making use of a Hybrid EffectiveField Theory (HEFT) approach to model the galaxy-matter relation on weaklynon-linear scales, initially proposed in Modi et al. (2020) (arXiv:1910.07097).This allows us to explore the enhancement in cosmological constraining powerenabled by extending the galaxy clustering scale range typically used inprojected large-scale structure analyses. Our analysis is based on a recomputedharmonic-space data vector and covariance matrix, carefully accounting for allsources of mode-coupling, non-Gaussianity and shot noise, which allows us toprovide robust goodness-of-fit measures. We use the \textsc{AbacusSummit} suiteof simulations to build an emulator for the HEFT model predictions. We findthat this model can explain the galaxy clustering and shear data up towavenumbers $k_{\rm max}\sim 0.6\, {\rm Mpc}^{-1}$. We constrain$(S_8,\Omega_m) = (0.786\pm 0.020,0.273^{+0.030}_{-0.036})$ at the fiducial$k_{\rm max}\sim 0.3\, {\rm Mpc}^{-1}$, improving to $(S_8,\Omega_m) =(0.786^{+0.015}_{-0.018},0.266^{+0.024}_{-0.027})$ at $k_{\rm max}\sim 0.5\,{\rm Mpc}^{-1}$. This represents a $\sim10\%$ and $\sim35\%$ improvement on theconstraints derived respectively on both parameters using a linear biasrelation on a reduced scale range ($k_{\rm max}\lesssim0.15\,{\rm Mpc}^{-1}$),in spite of the 15 additional parameters involved in the HEFT model. Weinvestigate whether HEFT can be used to constrain the Hubble parameter and find$H_0= 70.7_{-3.5}^{+3.0}\,{\rm km}\,s^{-1}\,{\rm Mpc}^{-1}$. Our constraintsare investigative and subject to certain caveats discussed in the text.

Hefty enhancement of cosmological constraints from the DES Y1 data using a Hybrid Effective Field Theory approach to galaxy bias