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Data-driven reconstruction of the late-time cosmic acceleration with f(T) gravity
Physics of the Dark Universe ( IF 5.0 ) Pub Date : 2021-04-10 , DOI: 10.1016/j.dark.2021.100812
Xin Ren , Thomas Hong Tsun Wong , Yi-Fu Cai , Emmanuel N. Saridakis

We use a combination of observational data in order to reconstruct the free function of f(T) gravity in a model-independent manner. Starting from the data-driven determined dark-energy equation-of-state parameter we are able to reconstruct the f(T) form. The obtained function is consistent with the standard ΛCDM cosmology within 1σ confidence level, however the best-fit value experiences oscillatory features. We parametrize it with a sinusoidal function with only one extra parameter comparing to ΛCDM paradigm, which is a small oscillatory deviation from it, close to the best-fit curve, and inside the 1σ reconstructed region. Similar oscillatory dark-energy scenarios are known to be in good agreement with observational data, nevertheless this is the first time that such a behavior is proposed for f(T) gravity. Finally, since the reconstruction procedure is completely model-independent, the obtained data-driven reconstructed f(T) form could release the tensions between ΛCDM estimations and local measurements, such as the H0 and σ8 ones.



中文翻译:

数据驱动的后期宇宙加速重建 FŤ 重力

我们使用观测数据的组合来重构自由的函数 FŤ以与模型无关的方式引力。从数据驱动的确定的暗能量状态方程参数开始,我们能够重建FŤ形式。所获得的功能与标准一致Λ内的CDM宇宙学 1个σ置信水平,但是最适合的值具有振荡特征。我们使用正弦函数对它进行参数化,与ΛCDM范式,与它的振荡偏差很小,接近最佳拟合曲线,并且在 1个σ重建区域。已知类似的振荡暗能量情景与观测数据非常吻合,但这是首次提出将这种行为用于FŤ重力。最后,由于重建过程完全与模型无关,因此获得的数据驱动重建FŤ 形式可以释放之间的紧张关系 ΛCDM估算值和本地测量值,例如 H0σ8 那些。

更新日期:2021-04-16
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