从扭转引力的有效场论解释宇宙学张力
Interpreting cosmological tensions from the effective field theory of torsional gravity
摘要：
在不同观测窗口的$Λ$ CDM情景中，宇宙学张力可能会出现，如果得到测量的证实，这可能表明新的物理学超出了标准范式。本文从有效场论（EFT）的观点出发，研究了如何同时缓解扭转引力中的$H_0$和$σ_8$张力。根据这些观察，我们构造了扭转引力的拉格朗日函数的具体模型。具体来说，我们考虑参数化$f(T)=-T-2Λ/M_P^2+αT^β$，其中两个三个参数是独立的。该模型可以有效地拟合观测值，解决两种张力。据我们所知，这是第一次修正的引力理论可以同时缓解$H_0$和$σ_8$张力，因此，提供了一个支持引力修正的额外论据。
英文摘要：
Cosmological tensions can arise within $Λ$CDM scenario amongst different observational windows, which may indicate new physics beyond the standard paradigm if confirmed by measurements. In this article, we report how to alleviate both the $H_0$ and $σ_8$ tensions simultaneously within torsional gravity from the perspective of effective field theory (EFT). Following these observations, we construct concrete models of Lagrangians of torsional gravity. Specifically, we consider the parametrization $f(T)=-T-2Λ/M_P^2+αT^β$, where two out of the three parameters are independent. This model can efficiently fit observations solving the two tensions. To our knowledge, this is the first time where a modified gravity theory can alleviate both $H_0$ and $σ_8$ tensions simultaneously, hence, offering an additional argument in favor of gravitational modification.
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