Spectrum of the axion dark sector

Spectrum of the axion dark sector
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轴子暗区的光谱

DOI:
10.1103/physrevd.96.083510
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发表时间:
2017
期刊:
影响因子:
5
通讯作者:
Stott M
Stott M
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Stott M

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轴子出现在粒子物理学标准模型的许多理论扩展中,特别是“弦轴向”。如果轴子质量和(有效)衰变常数在特定范围内,那么轴子对宇宙学暗物质和暗能量密度有贡献。我们计算背景宇宙学(准)观测模型与大量的轴子场,质量和衰变常数从统计分布。这将参数的数量从减少到少量的“超参数”。我们考虑了一些分布,从那些纯粹出于统计考虑的那些结构是指定根据一类M-理论模型。使用贝叶斯方法,我们能够约束分布的超参数。在某些情况下,超参数可以与弦理论相关,例如,限制轴子与模量的数量比,或者提供正确的遗迹密度所需的典型衰变常数尺度。我们的方法结合使用随机矩阵理论和贝叶斯网络。
Axions arise in many theoretical extensions of the Standard Model of particle physics, in particular the “string axiverse.” If the axion masses,, and (effective) decay constants,, lie in specific ranges, then axions contribute to the cosmological dark matter and dark energy densities. We compute the background cosmological (quasi)observables for models with a large number of axion fields,, with the masses and decay constants drawn from statistical distributions. This reduces the number of parameters fromto a small number of “hyperparameters.” We consider a number of distributions, from those motivated purely by statistical considerations to those where the structure is specified according to a class of M-theory models. Using Bayesian methods, we are able to constrain the hyperparameters of the distributions. In some cases, the hyperparameters can be related to string theory, e.g., constraining the number ratio of axions to moduli, or the typical decay constant scale needed to provide the correct relic densities. Our methodology incorporates the use of both random matrix theory and Bayesian networks.
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发表时间: 2008
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