Year: 2014
Type: article
Abstract: 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 NL . The multipoles encode the effects of the short distance modes on the long-wavelength universe and absorb UV divergences when present. There are no IR divergences in LEFT. Some of the parameters that control the perturbative approach are not assumed to be small and can be automatically resummed. We present an illustrative one-loop calculation for a power law universe. We describe the dynamics both at the level of the equations of motion and through an action formalism.
Authors: Rafael A. Porto, Leonardo Senatore, Matias Zaldarriaga
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: bronze
Awards: G222768804, PROBLEMS IN PARTICLE THEORY, G5049084808, PROBLEMS IN PARTICLE THEORY, Connecting Primordial Interactions and Cosmological Observations, FROM COSMOLOGICAL OBSERVATIONS TO FUNDAMENTAL INTERACTIONS, Probing Fundamental Physics on Cosmological Scales, Probing Fundamental Physics on Cosmological Scales, Postdoctoral program in theoretical and observational astrophysics, The Astrophysics of Hydrogen and Helium Reionization
OpenAlex ID: W2063544778