Citation

BibTex format

@article{Cable:2022:10.1103/PhysRevD.106.123522,
author = {Cable, A and Rajantie, A},
doi = {10.1103/PhysRevD.106.123522},
journal = {Physical Review D: Particles, Fields, Gravitation and Cosmology},
title = {Second-order stochastic theory for self-interacting scalar fields in de Sitter spacetime},
url = {http://dx.doi.org/10.1103/PhysRevD.106.123522},
volume = {106},
year = {2022}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - We introduce a second-order stochastic effective theory for light scalar fields in de Sitter spacetime, extending the validity of the stochastic approach beyond the massless limit and demonstrating how it can be used to compute long-distance correlation functions nonperturbatively. The parameters of the second-order stochastic theory are determined from quantum field theory through a perturbative calculation, which is valid if the self-interaction parameter  satisfies  ²/², where  is the scalar and  is the Hubble rate. Therefore, it allows stronger self-interactions than conventional perturbation theory, which is limited to  / by infrared divergences. We demonstrate the applicability of the second-order stochastic theory by comparing its results with perturbative quantum field theory and overdamped stochastic calculations, and discuss the prospects of improving its accuracy with a full one-loop calculation of its parameters.
AU  - Cable,A
AU  - Rajantie,A
DO  - 10.1103/PhysRevD.106.123522
PY  - 2022///
SN  - 1550-7998
TI  - Second-order stochastic theory for self-interacting scalar fields in de Sitter spacetime
T2  - Physical Review D: Particles, Fields, Gravitation and Cosmology
UR  - http://dx.doi.org/10.1103/PhysRevD.106.123522
VL  - 106
ER  -
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