The uniform-density gauge 2EMT matches the comoving gauge in the strict infrared, separates at finite gradient order, and acquires a 1/epsilon and 1/sigma_2^2 enhancement in the ultraviolet from the slowly evolving density clock.
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Quadratic effective energy--momentum tensor on uniform-density hypersurfaces during slow-roll inflation
The uniform-density gauge 2EMT matches the comoving gauge in the strict infrared, separates at finite gradient order, and acquires a 1/epsilon and 1/sigma_2^2 enhancement in the ultraviolet from the slowly evolving density clock.