Yano-Schrödinger hyperfluid: Cosmological implications

IF 10.5 4区 物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS
Himanshu Chaudhary , Saddam Hussain
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引用次数: 0

Abstract

Perfect cosmological hyperfluids generalize the concept of a perfect fluid within the framework of metric affine gravity. These hyperfluids encode the microstructure of matter including shear, dilation, and spin via the hypermomentum tensor. In this paper, we focus on the observational constraints of the recently introduced Yano-Schrödinger hyperfluid, which sources a special type of nonmetricity, that preserves the lengths of vectors under autoparallel transport. We propose a model in which the effective nonmetricity contributions to pressure and matter density are related linearly as peff=ωρeff. This assumption allows for a straightforward parameterization of deviations from standard cosmological behavior while maintaining analytical tractability. To constrain the effective equation of state parameter ω, we perform a Bayesian parameter estimation using Nested Sampling, implemented via the PyPolyChord library. We use Baryon Acoustic Oscillation measurements from the Dark Energy Spectroscopic Instrument (DESI) Data Release 2 (DR2), along with Type Ia supernova and Cosmic Chronometer data. In our analysis, we treat rd as a free parameter, enabling late-time data to extract posterior distributions for the Hubble constant (H0) and the sound horizon (rd), along with the corresponding model parameters. Our results yield H0=67.4±4.0 km s−1 Mpc−1 and rd=148.8±7.4 Mpc, with ω=0.488. Finally, we use the logarithm of the Bayes factor to compare different Yano-Schrödinger model against the ΛCDM model. We find that the LESC model provides a better fit to the data, suggesting that modifications to metric-affine gravity could offer viable alternatives to the standard cosmological paradigm.
Yano-Schrödinger超流体:宇宙学意义
完美宇宙学超流体在度量仿射引力的框架内推广了完美流体的概念。这些超流体通过超动量张量编码物质的微观结构,包括剪切、膨胀和自旋。在本文中,我们重点讨论了最近引入的Yano-Schrödinger超流体的观测约束,它产生了一种特殊类型的非度量性,它在自平行传输下保留了矢量的长度。我们提出了一个模型,其中有效非度量性对压力和物质密度的贡献线性相关为peff=ωρeff。这一假设允许对偏离标准宇宙学行为的偏差进行直接参数化,同时保持分析的可追溯性。为了约束状态参数ω的有效方程,我们使用嵌套采样执行贝叶斯参数估计,通过PyPolyChord库实现。我们使用了暗能量光谱仪器(DESI)数据发布2 (DR2)的重子声学振荡测量数据,以及Ia型超新星和宇宙天文钟的数据。在我们的分析中,我们将rd视为一个自由参数,使后期数据能够提取哈勃常数(H0)和声视界(rd)以及相应的模型参数的后验分布。H0=67.4±4.0 km s−1 Mpc−1,rd=148.8±7.4 Mpc, ω=−0.488。最后,我们使用贝叶斯因子的对数来比较不同的Yano-Schrödinger模型和ΛCDM模型。我们发现LESC模型更符合数据,这表明对度量仿射引力的修正可以为标准宇宙学范式提供可行的替代方案。
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
Journal of High Energy Astrophysics Earth and Planetary Sciences-Space and Planetary Science
CiteScore
9.70
自引率
5.30%
发文量
38
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.
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