Simulation-based marginal likelihood for cluster strong lensing cosmology

Simulation-based marginal likelihood for cluster strong lensing cosmology
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基于模拟的星团强透镜宇宙学边际似然

DOI:
10.1093/mnras/stx2262
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发表时间:
2018
期刊:
arXiv: Cosmology and Nongalactic Astrophysics
影响因子:
--
通讯作者:
Ragone-Figueroa
Ragone-Figueroa
中科院分区:
--
文献类型:
--
作者:
Killedar;Borgani;Fabjan;Granato;Meneghetti;Planelles;Ragone-Figueroa

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将观测到的星系团和预测的强透镜性质进行比较,通常被用来声称与Λ冷暗物质宇宙论的张力或一致性。然而,这种宇宙学测试的标准方法无法量化对一种宇宙学的偏好。我们主张使用基于以下汇总统计量的边缘似然来近似相关的贝叶斯因子:爱因斯坦半径与星团质量、α和β之间的标度关系参数的后验概率分布函数。我们首次展示了一种估计边缘似然的方法,该方法使用X射线选择的0.5质量星系团作为例子,并使用星系团的N体和流体动力学模拟。我们研究了这一估计中的不确定性以及比较竞争宇宙学的能力,这是由于对重子过程的不完全描述、团簇选择标准、红移分布和动力学状态的差异所引起的。不同超密度下三轴团簇质量之间的关系为强透镜实验提供了一种很有前途的替代方法。
Comparisons between observed and predicted strong lensing properties of galaxy clusters have been routinely used to claim either tension or consistency with Λ cold dark matter cosmology. However, standard approaches to such cosmological tests are unable to quantify the preference for one cosmology over another. We advocate approximating the relevant Bayes factor using a marginal likelihood that is based on the following summary statistic: the posterior probability distribution function for the parameters of the scaling relation between Einstein radii and cluster mass, α and β. We demonstrate, for the first time, a method of estimating the marginal likelihood using the X-ray selectedz> 0.5 Massive Cluster Survey clusters as a case in point and employing bothN-body and hydrodynamic simulations of clusters. We investigate the uncertainty in this estimate and consequential ability to compare competing cosmologies, which arises from incomplete descriptions of baryonic processes, discrepancies in cluster selection criteria, redshift distribution and dynamical state. The relation between triaxial cluster masses at various overdensities provides a promising alternative to the strong lensing test.
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