Citation

BibTex format

@article{Markkanen:2020:03/049,
author = {Markkanen, T and Rajantie, A},
doi = {03/049},
journal = {Journal of Cosmology and Astroparticle Physics},
pages = {1--23},
title = {Scalar correlation functions for a double-well potential in de Sitter space},
url = {http://dx.doi.org/10.1088/1475-7516/2020/03/049},
volume = {2020},
year = {2020}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - We use {the spectral representation of }the stochastic Starobinsky-Yokoyama approach to compute correlation functions in de Sitter space for a scalar field with a symmetric or asymmetric double-well potential. The terms in the spectral expansion are determined by the eigenvalues and eigenfunctions of the time-independent Fokker-Planck differential operator, and we solve them numerically. The long-distance asymptotic behaviour is given by the lowest state in the spectrum, but we demonstrate that the magnitude of the coeffients of different terms can be very different, and the correlator can be dominated by different terms at different distances. This can give rise to potentially observable cosmological signatures. In many cases the dominant states in the expansion do not correspond to small fluctuations around a minimum of the potential and are therefore not visible in perturbation theory. We discuss the physical interpretation these states, which can be present even when the potential has only one minimum.
AU  - Markkanen,T
AU  - Rajantie,A
DO  - 03/049
EP  - 23
PY  - 2020///
SN  - 1475-7516
SP  - 1
TI  - Scalar correlation functions for a double-well potential in de Sitter space
T2  - Journal of Cosmology and Astroparticle Physics
UR  - http://dx.doi.org/10.1088/1475-7516/2020/03/049
UR  - http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000528029100050&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
UR  - https://iopscience.iop.org/article/10.1088/1475-7516/2020/03/049
VL  - 2020
ER  -
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