Comparison of ΛCDM and Rh = ct with updated galaxy cluster fgas measurements using Bayesian inference

IF 10.2 4区物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS

Journal of High Energy Astrophysics Pub Date : 2024-06-06 DOI:10.1016/j.jheap.2024.06.003

Kunj Panchal, Shantanu Desai

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引用次数: 0

Abstract

We use updated gas mass fraction measurements of 44 massive dynamically relaxed galaxy clusters collated in Mantz et al. (2022) to distinguish between the standard ΛCDM model and $R_{h} = c t$ universe. For this purpose, we use Bayesian model selection to compare the efficacy of both these cosmological models given the data. The gas mass fraction is modeled using both cosmology-dependent terms and also astrophysical parameters, which account for the variation with cluster mass and redshift. We used two different prior choices for some of the astrophysical parameters. We find a Bayes factors of 50 and 5 for ΛCDM as compared to $R_{h} = c t$ for these two prior choices. This implies that ΛCDM is favored compared to $R_{h} = c t$ with significance ranging from substantial to very strong.

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利用贝叶斯推理比较ΛCDM和Rh = ct与更新的星系团fgas测量结果

我们利用 Mantz 等人（2022 年）整理的 44 个大质量动态松弛星系团的最新气体质量分数测量数据来区分标准ΛCDM 模型和 Rh=ct 宇宙。为此，我们使用贝叶斯模型选择法来比较这两种宇宙学模型在数据条件下的有效性。气体质量分数的建模既使用了宇宙学相关项，也使用了天体物理参数，这些参数说明了气体质量分数随星团质量和红移的变化。我们对一些天体物理参数使用了两种不同的先验选择。我们发现，与Rh=ct相比，在这两种先验选择下，ΛCDM的贝叶斯因子分别为50和5。这意味着与Rh=ct相比，ΛCDM更受青睐，其重要性从很大到很强不等。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of High Energy Astrophysics Earth and Planetary Sciences-Space and Planetary Science

CiteScore

9.70

自引率

5.30%

发文量

审稿时长

65 days

期刊介绍： The journal welcomes manuscripts on theoretical models, simulations, and observations of highly energetic astrophysical objects both in our Galaxy and beyond. Among those, black holes at all scales, neutron stars, pulsars and their nebula, binaries, novae and supernovae, their remnants, active galaxies, and clusters are just a few examples. The journal will consider research across the whole electromagnetic spectrum, as well as research using various messengers, such as gravitational waves or neutrinos. Effects of high-energy phenomena on cosmology and star-formation, results from dedicated surveys expanding the knowledge of extreme environments, and astrophysical implications of dark matter are also welcomed topics.

Comparison of ΛCDM and Rh = ct with updated galaxy cluster fgas measurements using Bayesian inference

Abstract

Comparison of ΛCDM and Rh = ct with updated galaxy cluster fgas measurements using Bayesian inference