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@article{Imrith:2018:10.1103/PhysRevD.98.043513,
author = {Imrith, SV and Mulryne, DJ and Rajantie, A},
doi = {10.1103/PhysRevD.98.043513},
journal = {Physical Review D - Particles, Fields, Gravitation and Cosmology},
title = {Nonperturbative delta N formalism},
url = {http://dx.doi.org/10.1103/PhysRevD.98.043513},
volume = {98},
year = {2018}
}

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TY  - JOUR
AB  - We revisit the question of how to calculate correlations of the curvature perturbation, ζ, using the δN formalism when one cannot employ a truncated Taylor expansion of N. This problem arises when one uses lattice simulations to probe the effects of isocurvature modes on models of reheating. Working in real space, we use an expansion in the cross-correlation between fields at different positions and present simple expressions for observables such as the power spectrum and the reduced bispectrum, fNL. These take the same form as those of the usual δN expressions, but with the derivatives of N replaced by nonperturbative δN coefficients. We test the validity of this expansion and, when compared to others in the literature, argue that our expressions are particularly well suited for use with simulations.
AU  - Imrith,SV
AU  - Mulryne,DJ
AU  - Rajantie,A
DO  - 10.1103/PhysRevD.98.043513
PY  - 2018///
SN  - 1550-2368
TI  - Nonperturbative delta N formalism
T2  - Physical Review D - Particles, Fields, Gravitation and Cosmology
UR  - http://dx.doi.org/10.1103/PhysRevD.98.043513
UR  - http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000441680600002&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
UR  - http://hdl.handle.net/10044/1/65393
VL  - 98
ER  -

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