Non-Gaussian signatures of multi-field inflation from string theory

弦理论中多场暴涨的非高斯特征

• 批准号: 210170592
• 负责人: Professor Dr. Jens Niemeyer
• 金额: --
• 依托单位: Institut für Astrophysik und Geophysik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2012
• 资助国家: 德国
• 起止时间: 2011-12-31 至 2015-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/210170592?language=en
• 关键词: Non; Gaussian; signatures; multi; field

Multi-field inflationary models are natural in string theory, yet their predictions are degenerate. If non-Gaussianities are observed in fluctuations of the cosmic microwave background radiation (CMBR) by the Planck satellite, simple single-field models are ruled out. Lifting this degeneracy is thus a most pressing task. Multi-field scenarios often include additional effects during inflation, such as the decay of fields or particle production and the associated backreaction. These effects can lead to unique, non-Gaussian signatures in higher order correlation functions of fluctuations in the CMBR. We propose to use non-Gaussianities, especially the shape function of the bi- and trispectrum, to identify those models that are most likely responsible for inflation. We plan to use and improve upon a recently proposed mode decomposition retaining information of the full shape function and investigate the efficiency of the mode decomposition for constructing initial conditions for cosmological simulations.

多场暴胀模型在弦论中是自然的，但它们的预言是退化的。如果普朗克卫星在宇宙微波背景辐射（CMBR）的波动中观察到非高斯性，那么简单的单场模型就被排除了。因此，解除这种简并是一项最紧迫的任务。多场情景通常包括暴胀期间的额外效应，例如场的衰变或粒子产生以及相关的反反应。这些效应可以导致CMBR中波动的高阶相关函数中的独特的非高斯签名。我们建议使用非高斯性，特别是双谱和三谱的形状函数，来识别那些最有可能导致通货膨胀的模型。我们计划使用和改进后，最近提出的模式分解保留信息的完整形状的功能和调查的效率模式分解构造初始条件的宇宙学模拟。