Inflaton or Curvaton? Constraints on Bimodal Primordial Spectra from Mixed Perturbations
We consider Cosmic Microwave Background constraints on inflation models for which the primordial power spectrum is a mixture of perturbations generated by inflaton fluctuations and fluctuations in a curvaton field. If future experiments do not detect isocurvature modes or large non-Gaussianity, it w...
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ftdatacite:10.48550/arxiv.1203.0693 2023-05-15T18:22:50+02:00 Inflaton or Curvaton? Constraints on Bimodal Primordial Spectra from Mixed Perturbations Kinney, William H. Dizgah, Azadeh Moradinezhad Riotto, Antonio 2012 https://dx.doi.org/10.48550/arxiv.1203.0693 https://arxiv.org/abs/1203.0693 unknown arXiv https://dx.doi.org/10.1103/physrevd.86.023527 arXiv.org perpetual, non-exclusive license http://arxiv.org/licenses/nonexclusive-distrib/1.0/ Cosmology and Nongalactic Astrophysics astro-ph.CO FOS Physical sciences article-journal Article ScholarlyArticle Text 2012 ftdatacite https://doi.org/10.48550/arxiv.1203.0693 https://doi.org/10.1103/physrevd.86.023527 2022-04-01T14:05:42Z We consider Cosmic Microwave Background constraints on inflation models for which the primordial power spectrum is a mixture of perturbations generated by inflaton fluctuations and fluctuations in a curvaton field. If future experiments do not detect isocurvature modes or large non-Gaussianity, it will not be possible to directly distinguish inflaton and curvaton contributions. We investigate whether current and future data can instead constrain the relative contributions of the two sources. We model the spectrum with a bimodal form consisting of a sum of two independent power laws, with different spectral indices. We quantify the ability of current and upcoming data sets to constrain the difference $Δn$ in spectral indices, and relative fraction $f$ of the subdominant power spectrum at a pivot scale of $k = 0.017\ {\rm Mpc^{-1}\ h}$. Data sets selected are the WMAP 7-year data, alone and in conjunction with South Pole Telescope data, and a synthetic data set comparable to the upcoming Planck data set. We find that current data show no increase in quality of fit for a mixed inflaton/curvaton power spectrum, and a pure power-law spectrum is favored. The ability to constrain independent parameters such as the tensor/scalar ratio is not substantially affected by the additional parameters in the fit. Planck will be capable of placing significant constraints on the parameter space for a bimodal spectrum. Text South pole DataCite Metadata Store (German National Library of Science and Technology) Pivot ENVELOPE(-30.239,-30.239,-80.667,-80.667) South Pole |
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Cosmology and Nongalactic Astrophysics astro-ph.CO FOS Physical sciences |
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Cosmology and Nongalactic Astrophysics astro-ph.CO FOS Physical sciences Kinney, William H. Dizgah, Azadeh Moradinezhad Riotto, Antonio Inflaton or Curvaton? Constraints on Bimodal Primordial Spectra from Mixed Perturbations |
topic_facet |
Cosmology and Nongalactic Astrophysics astro-ph.CO FOS Physical sciences |
description |
We consider Cosmic Microwave Background constraints on inflation models for which the primordial power spectrum is a mixture of perturbations generated by inflaton fluctuations and fluctuations in a curvaton field. If future experiments do not detect isocurvature modes or large non-Gaussianity, it will not be possible to directly distinguish inflaton and curvaton contributions. We investigate whether current and future data can instead constrain the relative contributions of the two sources. We model the spectrum with a bimodal form consisting of a sum of two independent power laws, with different spectral indices. We quantify the ability of current and upcoming data sets to constrain the difference $Δn$ in spectral indices, and relative fraction $f$ of the subdominant power spectrum at a pivot scale of $k = 0.017\ {\rm Mpc^{-1}\ h}$. Data sets selected are the WMAP 7-year data, alone and in conjunction with South Pole Telescope data, and a synthetic data set comparable to the upcoming Planck data set. We find that current data show no increase in quality of fit for a mixed inflaton/curvaton power spectrum, and a pure power-law spectrum is favored. The ability to constrain independent parameters such as the tensor/scalar ratio is not substantially affected by the additional parameters in the fit. Planck will be capable of placing significant constraints on the parameter space for a bimodal spectrum. |
format |
Text |
author |
Kinney, William H. Dizgah, Azadeh Moradinezhad Riotto, Antonio |
author_facet |
Kinney, William H. Dizgah, Azadeh Moradinezhad Riotto, Antonio |
author_sort |
Kinney, William H. |
title |
Inflaton or Curvaton? Constraints on Bimodal Primordial Spectra from Mixed Perturbations |
title_short |
Inflaton or Curvaton? Constraints on Bimodal Primordial Spectra from Mixed Perturbations |
title_full |
Inflaton or Curvaton? Constraints on Bimodal Primordial Spectra from Mixed Perturbations |
title_fullStr |
Inflaton or Curvaton? Constraints on Bimodal Primordial Spectra from Mixed Perturbations |
title_full_unstemmed |
Inflaton or Curvaton? Constraints on Bimodal Primordial Spectra from Mixed Perturbations |
title_sort |
inflaton or curvaton? constraints on bimodal primordial spectra from mixed perturbations |
publisher |
arXiv |
publishDate |
2012 |
url |
https://dx.doi.org/10.48550/arxiv.1203.0693 https://arxiv.org/abs/1203.0693 |
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ENVELOPE(-30.239,-30.239,-80.667,-80.667) |
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Pivot South Pole |
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Pivot South Pole |
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South pole |
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South pole |
op_relation |
https://dx.doi.org/10.1103/physrevd.86.023527 |
op_rights |
arXiv.org perpetual, non-exclusive license http://arxiv.org/licenses/nonexclusive-distrib/1.0/ |
op_doi |
https://doi.org/10.48550/arxiv.1203.0693 https://doi.org/10.1103/physrevd.86.023527 |
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1766202250937499648 |