We have studied LRS Bianchi type I cosmological models with barotropic perfect fluid and cosmic string in the framework of [Formula: see text] theory of gravitation. We have assumed that expansion of the model is proportional to the shear scalar. Hybrid law of expansion is also used to solve the field equations. Three different functional forms of the function [Formula: see text] such as [Formula: see text] [Formula: see text] and [Formula: see text] are chosen for investigation. It is observed that the universe is dominated by quintessence type dark energy. The universe is accelerating, expanding and anisotropic.

中文翻译：

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f(T)万有引力理论中具有完美流体和弦的Bianchi I型宇宙学模型

我们在[公式：见正文]万有引力理论的框架下，研究了具有正压完美流体和宇宙弦的LRS Bianchi I型宇宙学模型。我们假设模型的扩展与剪切标量成正比。混合膨胀定律也用于求解场方程。[公式：见正文][公式：见正文][公式：见正文]和[公式：见正文]等函数[公式：见正文]的三种不同的函数形式被选择用于调查。据观察，宇宙以精华型暗能量为主。宇宙正在加速、膨胀和各向异性。