A Lagrangian effective field theory
We have continued the development of Lagrangian, cosmological perturbation theory for the loworder correlators of the matter density field. We provide a new route to understanding how the effective field theory (EFT) of largescale structure can be formulated in the Lagrandian framework and a new resummation scheme, comparing our results to earlier work and to a series of highresolution Nbody simulations in both Fourier and configuration space. The `new' terms arising from EFT serve to tame the dependence of perturbation theory on smallscale physics and improve agreement with simulations (though with an additional free parameter). We find that all of our models fare well on scales larger than about two to three times the nonlinear scale, but fail as the nonlinear scale is approached. This is slightly less reach than has been seen previously. At low redshift the Lagrangian model fares as well as EFT in its Eulerian formulation, but at higher z the Eulerian EFT fits the data to smaller scales than resummed, Lagrangian EFT. Furthermore, all the perturbative models fare better than linear theory.
 Authors:

^{[1]};
^{[2]};
^{[2]}
 Stanford Univ., Stanford, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
 Univ. of California, Berkeley, CA (United States)
 Publication Date:
 Report Number(s):
 SLACPUB16655
Journal ID: ISSN 14757516; arXiv:1506.05264
 Grant/Contract Number:
 AC0276SF00515
 Type:
 Accepted Manuscript
 Journal Name:
 Journal of Cosmology and Astroparticle Physics
 Additional Journal Information:
 Journal Volume: 2015; Journal Issue: 09; Journal ID: ISSN 14757516
 Publisher:
 Institute of Physics (IOP)
 Research Org:
 SLAC National Accelerator Lab., Menlo Park, CA (United States)
 Sponsoring Org:
 USDOE Office of Science (SC)
 Country of Publication:
 United States
 Language:
 English
 Subject:
 79 ASTRONOMY AND ASTROPHYSICS; astrophysics; ASTRO; cosmological parameters from LSS; power spectrum; baryon acoustic oscillations; galaxy clustering
 OSTI Identifier:
 1270630
Vlah, Zvonimir, White, Martin, and Aviles, Alejandro. A Lagrangian effective field theory. United States: N. p.,
Web. doi:10.1088/14757516/2015/09/014.
Vlah, Zvonimir, White, Martin, & Aviles, Alejandro. A Lagrangian effective field theory. United States. doi:10.1088/14757516/2015/09/014.
Vlah, Zvonimir, White, Martin, and Aviles, Alejandro. 2015.
"A Lagrangian effective field theory". United States.
doi:10.1088/14757516/2015/09/014. https://www.osti.gov/servlets/purl/1270630.
@article{osti_1270630,
title = {A Lagrangian effective field theory},
author = {Vlah, Zvonimir and White, Martin and Aviles, Alejandro},
abstractNote = {We have continued the development of Lagrangian, cosmological perturbation theory for the loworder correlators of the matter density field. We provide a new route to understanding how the effective field theory (EFT) of largescale structure can be formulated in the Lagrandian framework and a new resummation scheme, comparing our results to earlier work and to a series of highresolution Nbody simulations in both Fourier and configuration space. The `new' terms arising from EFT serve to tame the dependence of perturbation theory on smallscale physics and improve agreement with simulations (though with an additional free parameter). We find that all of our models fare well on scales larger than about two to three times the nonlinear scale, but fail as the nonlinear scale is approached. This is slightly less reach than has been seen previously. At low redshift the Lagrangian model fares as well as EFT in its Eulerian formulation, but at higher z the Eulerian EFT fits the data to smaller scales than resummed, Lagrangian EFT. Furthermore, all the perturbative models fare better than linear theory.},
doi = {10.1088/14757516/2015/09/014},
journal = {Journal of Cosmology and Astroparticle Physics},
number = 09,
volume = 2015,
place = {United States},
year = {2015},
month = {9}
}