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Atsushi Taruya focuses on theoretical and observational cosmology, particularly the nonlinear formation of large-scale structure and its connection to galaxy surveys. He develops perturbation-theory-based models incorporating nonlinear gravitational evolution and redshift-space distortions, and applies them to observational data to derive robust cosmological constraints. 

His interests also include interdisciplinary topics such as gravitational-wave cosmology, exoplanet characterization, and non-equilibrium dynamics of self-gravitating systems. More recently, he studies the nature of dark matter, including phase-space structure of halos and searches using terrestrial environmental data.