Bayesian evidence of the post-Planck curvaton
Bayesian evidence of the post-Planck curvaton
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后普朗克曲线的贝叶斯证据
DOI：
10.1088/1475-7516/2015/08/010
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发表时间：
2015
影响因子：
6.4
通讯作者：
C. Byrnes
中科院分区：
文献类型：
--
作者：
R. Hardwick;C. Byrnes
我们使用最近发布的普朗克数据，对二次曲线模型中的场景进行贝叶斯模型比较，确定两者相对于ΛCDM一致性模型和单场二次膨胀的不利程度。尽管有三个额外的模型参数，最简单的曲率情景相对于单场二次暴胀并不不利，当我们包括BICEP/Keck/Planck联合分析时，它变得比单场模型更有利。在所有情况下，我们都假设有一个瞬间的暴胀衰减，并且没有幸存的等曲率扰动。尽管普朗克成功地达到了其预测测量精度，但我们表明，到目前为止，局部非高斯性的限制还不够精确，无法对证据比产生任何重大影响。我们还确定了未来测量所需的精度σ(fNL)，假设fNL的基准值为- 5/4或10.8，以使曲率不再不利于ΛCDM参数化，并讨论了未来测量预测的精度增加对fNL可能产生的影响。我们表明，我们的结果对我们选择的先验不是很敏感。
We perform a Bayesian model comparison for scenarios within the quadratic curvaton model, determining the degree to which both are disfavoured with respect to the ΛCDM concordance model and single-field quadratic inflation, using the recent Planck data release. Despite having three additional model parameters, the simplest curvaton scenario is not disfavoured relative to single-field quadratic inflation, and it becomes favoured against this single-field model when we include the joint BICEP/Keck/Planck analysis. In all cases we assume an instantaneous inflaton decay and no surviving isocurvature perturbations. Despite the success of Planck reaching its forecast measurement accuracy, we show that the current constraints on local non-Gaussianity are insufficiently precise to have any significant impact on the evidence ratios so far. We also determine the precision σ(fNL) required by future measurements assuming a fiducial value of fNL=−5/4 or 10.8 to no longer disfavour the curvaton against the ΛCDM parametrisation, and we discuss the effect that the predicted increase in precision from future measurements on fNL may have. We show that our results are not very sensitive to our choice of priors.
影响因子：
5
作者：
C. Byrnes;Marina Cortês;A. Liddle
通讯作者：
C. Byrnes;Marina Cortês;A. Liddle