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Exploring Two-Field Inflation in the Wess-Zumino Model

We explore inflation via the effective potential of the minimal Wess-Zumino model, considering both the real and imaginary components of the complex field. Using transport techniques, we calculate the full allowed range of $n_s$, $r$ and $f_{\rm NL}$ for different choices of the single free paramete...

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Detalles Bibliográficos
Autores principales: Ellis, John, Mavromatos, Nick E., Mulryne, David J.
Lenguaje:eng
Publicado: 2014
Materias:
Acceso en línea:https://dx.doi.org/10.1088/1475-7516/2014/05/012
http://cds.cern.ch/record/1644646
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author Ellis, John
Mavromatos, Nick E.
Mulryne, David J.
author_facet Ellis, John
Mavromatos, Nick E.
Mulryne, David J.
author_sort Ellis, John
collection CERN
description We explore inflation via the effective potential of the minimal Wess-Zumino model, considering both the real and imaginary components of the complex field. Using transport techniques, we calculate the full allowed range of $n_s$, $r$ and $f_{\rm NL}$ for different choices of the single free parameter, $v$, and present the probability distribution of these signatures given a simple choice for the prior distribution of initial conditions. Our work provides a case study of multi-field inflation in a simple but realistic setting, with important lessons that are likely to apply more generally. For example, we find that there are initial conditions consistent with observations of $n_s$ and $r$ for values of $v$ that would be excluded if only evolutions in the real field direction were to be considered, and that these may yield enhanced values of $f_{\rm NL}$. Moreover, we find that initial conditions fixed at high energy density, where the potential is close to quartic in form, can still lead to evolutions in a concave region of the potential during the observable number of e-folds, as preferred by present data. The Wess-Zumino model therefore provides an illustration that multi-field dynamics must be taken into account when seeking to understand fully the phenomenology of such models of inflation.
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spelling cern-16446462023-03-14T17:48:38Zdoi:10.1088/1475-7516/2014/05/012http://cds.cern.ch/record/1644646engEllis, JohnMavromatos, Nick E.Mulryne, David J.Exploring Two-Field Inflation in the Wess-Zumino ModelAstrophysics and AstronomyWe explore inflation via the effective potential of the minimal Wess-Zumino model, considering both the real and imaginary components of the complex field. Using transport techniques, we calculate the full allowed range of $n_s$, $r$ and $f_{\rm NL}$ for different choices of the single free parameter, $v$, and present the probability distribution of these signatures given a simple choice for the prior distribution of initial conditions. Our work provides a case study of multi-field inflation in a simple but realistic setting, with important lessons that are likely to apply more generally. For example, we find that there are initial conditions consistent with observations of $n_s$ and $r$ for values of $v$ that would be excluded if only evolutions in the real field direction were to be considered, and that these may yield enhanced values of $f_{\rm NL}$. Moreover, we find that initial conditions fixed at high energy density, where the potential is close to quartic in form, can still lead to evolutions in a concave region of the potential during the observable number of e-folds, as preferred by present data. The Wess-Zumino model therefore provides an illustration that multi-field dynamics must be taken into account when seeking to understand fully the phenomenology of such models of inflation.We explore inflation via the effective potential of theminimal Wess-Zumino model, considering both the real and imaginarycomponents of the complex field. Using transport techniques, wecalculate the full allowed range of ns, r and fNL fordifferent choices of the single free parameter, v, and present theprobability distribution of these signatures given a simple choicefor the prior distribution of initial conditions. Our work providesa case study of multi-field inflation in a simple but realisticsetting, with important lessons that are likely to apply moregenerally. For example, we find that there are initial conditionsconsistent with observations of ns and r for values of v thatwould be excluded if only evolutions in the real field directionwere to be considered, and that these may yield enhanced values offNL. Moreover, we find that initial conditions fixed at highenergy density, where the potential is close to quartic in form, canstill lead to evolutions in a concave region of the potential duringthe observable number of e-folds, as preferred by present data. TheWess-Zumino model therefore provides an illustration thatmulti-field dynamics must be taken into account when seeking tounderstand fully the phenomenology of such models ofinflation.We explore inflation via the effective potential of the minimal Wess-Zumino model, considering both the real and imaginary components of the complex field. Using transport techniques, we calculate the full allowed range of $n_s$, $r$ and $f_{\rm NL}$ for different choices of the single free parameter, $v$, and present the probability distribution of these signatures given a simple choice for the prior distribution of initial conditions. Our work provides a case study of multi-field inflation in a simple but realistic setting, with important lessons that are likely to apply more generally. For example, we find that there are initial conditions consistent with observations of $n_s$ and $r$ for values of $v$ that would be excluded if only evolutions in the real field direction were to be considered, and that these may yield enhanced values of $f_{\rm NL}$. Moreover, we find that initial conditions fixed at high energy density, where the potential is close to quartic in form, can still lead to evolutions in a concave region of the potential during the observable number of e-folds, as preferred by present data. The Wess-Zumino model therefore provides an illustration that multi-field dynamics must be taken into account when seeking to understand fully the phenomenology of such models of inflation.arXiv:1401.6078KCL-PH-TH-2014-01LCTS-2014-01CERN-PH-TH-2014-003KCL-PH-TH-2014-01LCTS-2014-01CERN-PH-TH-2014-003oai:cds.cern.ch:16446462014-01-23
spellingShingle Astrophysics and Astronomy
Ellis, John
Mavromatos, Nick E.
Mulryne, David J.
Exploring Two-Field Inflation in the Wess-Zumino Model
title Exploring Two-Field Inflation in the Wess-Zumino Model
title_full Exploring Two-Field Inflation in the Wess-Zumino Model
title_fullStr Exploring Two-Field Inflation in the Wess-Zumino Model
title_full_unstemmed Exploring Two-Field Inflation in the Wess-Zumino Model
title_short Exploring Two-Field Inflation in the Wess-Zumino Model
title_sort exploring two-field inflation in the wess-zumino model
topic Astrophysics and Astronomy
url https://dx.doi.org/10.1088/1475-7516/2014/05/012
http://cds.cern.ch/record/1644646
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AT mavromatosnicke exploringtwofieldinflationinthewesszuminomodel
AT mulrynedavidj exploringtwofieldinflationinthewesszuminomodel