Bayesian Analysis of Inflation: Parameter Estimation for Single Field Models
Bayesian Analysis of Inflation: Parameter Estimation for Single Field Models
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DOI：
10.1103/physrevd.83.043505
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发表时间：
2010-07
影响因子：
5
通讯作者：
M. Mortonson;H. Peiris;R. Easther
中科院分区：
文献类型：
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作者：
M. Mortonson;H. Peiris;R. Easther
未来的天体物理数据集有望加强对暴胀模型的约束，而提取这些约束需要与数据质量相称的方法和工具。在本文中，我们描述ModeCode，一个新的，公开可用的代码，计算原始标量和张量功率谱的单场膨胀模型。ModeCode数值求解暴胀模式方程，避免了慢滚近似。它与CAMB和CosmoMC接口，计算宇宙微波背景角功率谱，并进行似然分析和参数估计。ModeCode可以轻松扩展到其他通货膨胀模型，未来的更新将包括贝叶斯模型比较。ModeCode的误差对普朗克或其他下一代实验数据分析的误差预算贡献微不足道。我们使用当前数据约束代表性的单场模型（{phi}{sup n}，n=2/3，1，2和4，自然膨胀和“山顶”膨胀），并提供普朗克预测。从目前的数据，我们得到弱，但不平凡的限制后暴胀物理，这是一个重要的不确定性来源的预测暴胀模型，而我们发现，普朗克将大大改善这些限制。特别是，普朗克将把暴胀动力学与视界的后暴胀增长联系起来，从而开始探索TeV和大统一理论尺度能量之间的“原始黑暗时代”。«少
Future astrophysical data sets promise to strengthen constraints on models of inflation, and extracting these constraints requires methods and tools commensurate with the quality of the data. In this paper we describe ModeCode, a new, publicly available code that computes the primordial scalar and tensor power spectra for single-field inflationary models. ModeCode solves the inflationary mode equations numerically, avoiding the slow roll approximation. It is interfaced with CAMB and CosmoMC to compute cosmic microwave background angular power spectra and perform likelihood analysis and parameter estimation. ModeCode is easily extendable to additional models of inflation, and future updates will include Bayesian model comparison. Errors from ModeCode contribute negligibly to the error budget for analyses of data from Planck or other next generation experiments. We constrain representative single-field models ({phi}{sup n} with n=2/3, 1, 2, and 4, natural inflation, and 'hilltop' inflation) using current data, and provide forecasts for Planck. From current data, we obtain weak but nontrivial limits on the post-inflationary physics, which is a significant source of uncertainty in the predictions of inflationary models, while we find that Planck will dramatically improve these constraints. In particular, Planck will link the inflationary dynamics with the post-inflationary growth of the horizon, andmore » thus begin to probe the ''primordial dark ages'' between TeV and grand unified theory scale energies.« less