Swampland和贝叶斯机器学习在约束宇宙学模型中的相互作用
Interplay between Swampland and Bayesian Machine Learning in constraining cosmological models
摘要：
从贝叶斯机器学习和字符串沼泽地标准之间的相互作用中获得对暗能量主导的宇宙的约束。这里的方法不同于以往的研究，因为在生成过程中使用沼泽标准，只有后来，拟合的结果进行验证，通过使用观测数据集。基于生成过程的贝叶斯学习方法应用于两个模型，并通过可用的$H(z)$数据验证结果。对于第一个模型，参数化的哈勃常数被认为是，第二，参数化的减速参数。这项研究的动机是最近的一项工作，其中限制字符串沼泽标准已获得高斯过程和$H(z)$数据。然而，这里获得的结果完全独立于观测数据，并允许估计宇宙的高红移行为将如何影响低红移行为。此外，这两个参数化的生成过程中，哈勃和减速参数，是独立的暗能量模型。结果，无论是数据和暗能量模型无关，可能会突出，在未来，沼泽地的边界为低红移宇宙，并有助于开发新的弦理论驱动的暗能量模型。所考虑的弦沼泽地标准可能与最近的观测结果相矛盾，这些观测结果表明幽灵暗能量不可能存在于沼泽地中。最后，当场的穿越范围在$z\in[0,5]$红移范围内时，观察到暗能量状态方程参数的自发符号转换，这是一个值得注意的现象，需要进一步分析。
英文摘要：
Constraints on a dark energy dominated Universe are obtained from an interplay between Bayesian Machine Learning and string Swampland criteria. The approach here differs from previous studies, since in the generative process Swampland criteria are used and, only later, the results of the fit are validated, by using observational data-sets. A generative process based Bayesian Learning approach is applied to two models and the results are validated by means of available $H(z)$ data. For the first model, a parametrization of the Hubble constant is considered and, for the second, a parametrization of the deceleration parameter. This study is motivated by a recent work, where constraints on string Swampland criteria have been obtained from a Gaussian Process and $H(z)$ data. However, the results obtained here are fully independent of the observational data and allow to estimate how the high-redshift behavior of the Universe will affect the low-redshift one. Moreover, both parameterizations in the generative process, for the Hubble and for the deceleration parameters, are independent of the dark energy model. The outcome, both data- and dark energy model-independent, may highlight, in the future, the borders of the Swampland for the low-redshift Universe and help to develop new string-theory motivated dark-energy models. The string Swampland criteria considered might be in tension with recent observations indicating that phantom dark energy cannot be in the Swampland. Finally, a spontaneous sign switch in the dark energy equation of state parameter is observed when the field traverses are in the $z\in[0,5]$ redshift range, a remarkable phenomenon requiring further analysis.
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