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2013

The Lagrangian-space Effective Field Theory of Large Scale Structures

Porto, Rafael A., Senatore, Leonardo, Zaldarriaga, Matias

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We introduce a Lagrangian-space Effective Field Theory (LEFT) formalism for the study of cosmological large scale structures.

Unlike the previous Eulerian-space construction, it is naturally formulated as an effective field theory of extended objects in Lagrangian space.
In LEFT the resulting finite size effects are described using a multipole expansion parameterized by a set of time dependent coefficients and organized in powers of the ratio of the wavenumber of interest $k$ over the non-linear scale $k_{\rm NL}$.
The multipoles encode the effects of the short distance modes on the long-wavelength universe and absorb UV divergences when present.

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