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arXiv 1109.2902astro-ph.COastro-ph.IM
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引力透镜模型选择的贝叶斯方法,SCMAV会议录

A Bayesian Approach to Gravitational Lens Model Selection, SCMAV proceeding

Irène Balmès

摘要:

强引力透镜是独特的宇宙学探测器。这些产生单个源的多个图像。无论是单个星系、星系群还是星系团,提取宇宙学相关信息都需要对透镜质量分布进行精确建模。各种各样的模型可用于此目的,然而它们之间的区别主要依赖于拟合的质量,而不考虑先验模型参数空间的大小。这是一个模型选择的问题,我们在贝叶斯统计框架中通过评估贝叶斯因子来解决这个问题。使用简单的测试情况下,我们表明,假设更复杂的镜头模型可能是不合理的,给定的可用数据的准确性水平。

英文摘要:

Strong gravitational lenses are unique cosmological probes. These produce multiple images of a single source. Whether a single galaxy, a group or a cluster, extracting cosmologically relevant information requires an accurate modeling of the lens mass distribution. A variety of models are available to this purpose, nevertheless discrimination between them as primarely relied on the quality of fit without accounting for the size of the prior model parameter space. This is a problem of model selection that we address in the Bayesian statistics framework by evaluating Bayes' factors. Using simple test cases, we show that the assumption of more complicate lens models may not be justified given the level of accuracy of the available data.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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