论文标题
在对称远程引力中可能的一致违规模型
Possible consistent model of parity violations in the symmetric teleparallel gravity
论文作者
论文摘要
许多违反重力模型的奇偶校验遭受了幽灵不稳定性问题的困扰。在本文中，我们考虑了一种对称的远程引力模型，该模型通过违反重力场与标量场之间的相互作用来扩展一般相对性等效模型。这些相互作用排除了较高的衍生物，并且在非赞誉张量中是二次的。通过对线性宇宙学扰动的研究，我们的结果表明，通常，该模型遭受了矢量扰动中幽灵模式的困难。但是，如果对这些奇偶校验的系数施加了特殊条件，则该模型可以是无幽灵的。
Many parity violating gravity models suffer from the ghost instability problem. In this paper, we consider a symmetric teleparallel gravity model that extends the general relativity equivalent model by several parity violating interactions between the gravitational field and a scalar field. These interactions exclude higher derivatives and are quadratic in the nonmetricity tensor. Through investigations on the linear cosmological perturbations, our results show that, in general, this model suffers from the difficulty caused by the existence of ghost mode in the vector perturbations. However, in cases where a special condition is imposed on the coefficients of these parity violating interactions, this model can be ghost free.
