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Updating constraints on f(T) teleparallel cosmology and the consistency with Big Bang Nucleosynthesis
Monthly Notices of the Royal Astronomical Society ( IF 4.7 ) Pub Date : 2020-11-05 , DOI: 10.1093/mnras/staa3368
Micol Benetti 1, 2 , Salvatore Capozziello 1, 2, 3 , Gaetano Lambiase 4, 5
Affiliation  

We focus on viable f(T) teleparallel cosmological models, namely power law, exponential and square-root exponential, carrying out a detailed study of their evolution at all scales. Indeed, these models were extensively analysed in the light of late time measurements, while it is possible to find only upper limits looking at the very early time behavior, i.e. satisfying the Big Bang Nucleosynthesis (BBN) data on primordial abundance of 4He. Starting from these indications, we perform our analysis considering both background and linear perturbations evolution and constrain, beyond the standard six cosmological parameters, the free parameters of f(T) models in both cases whether the BBN consistency relation is considered or not. We use a combination of Cosmic Microwave Background, Baryon Acoustic Oscillation, Supernovae Ia and galaxy clustering measurements, and find that very narrow constraints on the free parameters of specific f(T) cosmology can be obtained, beyond any previous precision. While no degeneration is found between the helium fraction, YP , and the free parameter of f(T), we note that these models constrain the current Hubble parameter, H0, higher then the standard model one, fully compatible with the Riess et al. measurement in the case of power law f(T) model. Moreover, the free parameters are constrained at nonzero values in more than 3sigma, showing a preference of the observations for extended gravity models.

中文翻译:

更新对 f(T) 遥平行宇宙学的约束以及与大爆炸核合成的一致性

我们专注于可行的 f(T) 遥平行宇宙学模型,即幂律、指数和平方根指数,在所有尺度上对其演化进行详细研究。事实上,根据后期测量对这些模型进行了广泛的分析,同时可以仅找到查看非常早期行为的上限,即满足关于 4He 原始丰度的大爆炸核合成 (BBN) 数据。从这些迹象开始,我们进行分析,同时考虑背景和线性扰动的演变,并在标准的六个宇宙学参数之外限制 f(T) 模型的自由参数,无论是否考虑 BBN 一致性关系。我们结合使用宇宙微波背景、重子声学振荡、超新星 Ia 和星系聚类测量,并发现可以得到对特定 f(T) 宇宙学自由参数的非常窄的限制,超出了以前的任何精度。虽然在氦分数 YP 和 f(T) 的自由参数之间没有发现退化,但我们注意到这些模型限制了当前的哈勃参数 H0,高于标准模型一,与 Riess 等人完全兼容。在幂律 f(T) 模型的情况下进行测量。此外,自由参数被限制在超过 3sigma 的非零值,显示了对扩展重力模型的观察偏好。和 f(T) 的自由参数,我们注意到这些模型约束了当前的哈勃参数 H0,高于标准模型一,与 Riess 等人完全兼容。在幂律 f(T) 模型的情况下进行测量。此外,自由参数被限制在超过 3sigma 的非零值,显示了对扩展重力模型的观察偏好。和 f(T) 的自由参数,我们注意到这些模型约束了当前的哈勃参数 H0,高于标准模型一,与 Riess 等人完全兼容。在幂律 f(T) 模型的情况下进行测量。此外,自由参数被限制在超过 3sigma 的非零值,显示了对扩展重力模型的观察偏好。
更新日期:2020-11-05
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