= Effective field theory of large-scale structure
{title2=EFTofLSS}
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The \b[effective field theory of large-scale structure] describes long-wavelength matter dynamics while representing unresolved short-scale motion through an effective <stress tensor>. It supplements <standard perturbation theory in cosmology> with symmetry-allowed terms whose coefficients can be calibrated from simulations or data. A leading correction scales as $k^2\delta^{(1)}$. Its role is to account for short-scale influence on long-scale predictions, not to resolve individual collapsed objects.<The Effective Field Theory of Cosmological Large Scale Structures by John Joseph M. Carrasco and others>[Abstract and effective-fluid construction: short-scale dynamics, effective parameters and perturbative observables]{ref}
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