Physical evolution of cosmological models can be tested by using expansion data, while growth history of these models is capable of testing dynamics of the inhomogeneous parts of energy density. The growth factor, as well as its growth index, gives a clear indication of the performance of cosmological models in the regime of structure formation of early Universe. In this work, we explore the growth index in several leading f(T) cosmological models, based on a specific class of teleparallel gravity theories. These have become prominent in the literature and lead to other formulations of teleparallel gravity. Here we adopt a generalized approach by obtaining the Mészáros equation without immediately imposing the subhorizon limit, because this assumption could lead to over-simplification. This approach gives avenue to study at which k modes the subhorizon limit starts to apply. We obtain numerical results for the growth factor and growth index for a variety of data set combinations for each f(T) model.

宇宙学模型的物理演化可以通过膨胀数据来测试，而这些模型的增长历史能够测试能量密度不均匀部分的动力学。生长因子及其生长指数清楚地表明了宇宙学模型在早期宇宙结构形成机制中的表现。在这项工作中，我们基于一类特定的远程平行引力理论，探索了几种领先的f ( T ) 宇宙学模型中的增长指数。这些已经在文献中变得突出，并导致了远程平行引力的其他表述。在这里，我们采用一种广义的方法，通过获得 Mészáros 方程而不立即施加亚视界限制，因为这种假设可能会导致过度简化。这种方法为研究亚视界极限在哪些k模式下开始应用提供了途径。我们获得了每个f ( T ) 模型的各种数据集组合的增长因子和增长指数的数值结果。