Exploration of the prerecombination universe with a high-dimensional model of an additional dark fluid
Exploration of the prerecombination universe with a high-dimensional model of an additional dark fluid
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DOI：
10.1103/physrevd.108.103527
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发表时间：
2023-07
影响因子：
5
通讯作者：
Michaela Meiers;L. Knox;Nils Schöneberg
中科院分区：
文献类型：
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作者：
Michaela Meiers;L. Knox;Nils Schöneberg
我们实现和探索了高维广义暗物质(HDGDM)，它具有作为红移函数的任意状态方程，作为{\Lambda}CDM的扩展。将这个模型暴露在CMB、BAO和超新星数据中，我们证明了使用边际后验分布很容易导致关于像这样的高维模型的可行性的误导性结论。我们讨论了这样的陷阱和相应的缓解策略，可以用来搜索参数空间的观测有利区域。我们进一步表明，HDGDM模型确实在其缓解哈勃紧张的能力方面显示出希望，一旦采用这种技术，我们在最佳拟合的状态方程中发现了有趣的特征，这些特征可以作为未来模型建立的灵感。
We implement and explore high-dimensional generalized dark matter (HDGDM) with an arbitrary equation of state as a function of redshift as an extension to {\Lambda}CDM.. Exposing this model to CMB, BAO, and supernova data, we demonstrate that the use of marginalized posterior distributions can easily lead to misleading conclusions on the viability of a high-dimensional model such as this one. We discuss such pitfalls and corresponding mitigation strategies, which can be used to search for an observationally favored region of the parameter space. We further show that the HDGDM model in particular does show promise in terms of its ability to ease the Hubble tension once such techniques are employed, and we find interesting features in the best-fitting equation of state that can serve as an inspiration for future model building.