论文标题
修改的远程平行重力模型中的宇宙学扰动：边界期限扩展
Cosmological perturbations in modified teleparallel gravity models: Boundary term extension
论文作者
论文摘要
电触电引力提供了一种新的途径，可以在其中构建超出一般相对性的引力模型。虽然可以动态地等同于一般相对性的方式构图触发性重力，但其修改主要不等于传统的修饰重力途径。 $ f（t，b）$重力是一种这样的引力理论，其中第二和第四阶贡献了对场方程的贡献。在这项工作中，我们探讨了这一新的重力框架的所有重要宇宙学扰动。我们得出引力传播方程，其矢量扰动稳定性条件及其标量扰动。与物质扰动一起，我们得出了该框架中有效的重力常数，并找到了一种有趣的分支行为，该行为取决于要探测的特定引力模型。我们讨论了这些结果与其他引力理论的关系。
Teleparallel gravity offers a new avenue in which to construct gravitational models beyond general relativity. While teleparallel gravity can be framed in a way to be dynamically equivalent to general relativity, its modifications are mostly not equivalent to the traditional route to modified gravity. $f(T,B)$ gravity is one such gravitational theory where the second and fourth order contributions to the field equations are decoupled. In this work, we explore the all important cosmological perturbations of this new framework of gravity. We derive the gravitational propagation equation, its vector perturbation stability conditions, and its scalar perturbations. Together with the matter perturbations, we derive the effective gravitational constant in this framework, and find an interesting branching behaviour that depends on the particular gravitational models being probed. We close with a discussion on the relation of these results with other gravitational theories.
