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首页> 外文期刊>International journal of modern physics, D. Gravitation, astrophysics, cosmology >Updated f(T) gravity constraints from high-redshift cosmography
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Updated f(T) gravity constraints from high-redshift cosmography

机译:更新了高红移宇宙图的f(T)重力约束

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摘要

In the last dozen years, a wide and variegated mass of observational data revealed that the universe is now expanding at an accelerated rate. In the absence of a well-based theory to interpret the observations, cosmography provides information about the evolution of the universe from measured distances, only assuming that the geometry can be described by the Friedmann-Lemaitre-Robertson-Walker metric. In this paper, we perform a high-redshift analysis which allows us to put constraints on the cosmographic parameters up to the fifth-order, thus inducing indirect constraints on any gravity theory. Here, we are interested in the so-called teleparallel gravity theory, f(T). Actually, we use the analytical expressions of the present day values of f(T) and its derivatives as functions of the cosmographic parameters to map the cosmography region of confidences into confidence ranges for f(T) and its derivative. Moreover, we show how these can be used to test some teleparallel gravity models without solving the dynamical equations. Our analysis is based on the Union2 Type Ia supernovae (SNIa) data set, a set of 28 measurements of the Hubble parameter, the Hubble diagram constructed from some gamma ray bursts (GRB) luminosity distance indicators and Gaussian priors on the distance from the baryon acoustic oscillations (BAOs) and the Hubble constant h. To perform our statistical analysis and to explore the probability distributions of the cosmographic parameters, we use the Markov chain Monte Carlo (MCMC) method.
机译:在过去的十二年中,大量多样的观测数据表明,宇宙现在正以加速的速度膨胀。在没有很好的理论来解释观测结果的情况下,宇宙学仅提供假设可以用Friedmann-Lemaitre-Robertson-Walker度量来描述几何形状,才能从测量距离提供有关宇宙演化的信息。在本文中,我们执行了一个高红移分析,该分析使我们可以将对宇宙学参数的约束设置为五阶,从而在任何引力理论上引入间接约束。在这里,我们对所谓的远平行重力理论f(T)感兴趣。实际上,我们使用f(T)及其衍生物的当日值的解析表达式作为宇宙照相参数的函数,将信任度的宇宙照相区域映射到f(T)及其衍生物的置信范围内。此外,我们展示了如何在不求解动力学方程的情况下将其用于测试某些遥平行重力模型。我们的分析基于Union2 Ia型超新星(SNIa)数据集,一组28个哈勃参数测量值,由一些伽马射线爆发(GRB)光度距离指示器和高斯先验值组成的哈勃图距重子的距离声振荡(BAO)和哈勃常数h。为了执行统计分析并探索宇宙学参数的概率分布,我们使用了马尔可夫链蒙特卡罗(MCMC)方法。

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