论文标题
变色龙标量场模型中的宇宙加速度和大地偏差
Cosmic Acceleration and Geodesic Deviation in Chameleon Scalar Field Model
论文作者
论文摘要
在考虑具有空间平坦FLRW背景的变色龙标量场模型的同时，我们研究了宇宙的延迟加速阶段，其中我们应用了通常在此模型中使用的典型电位。通过对模型的自由参数设置一些约束，我们表明在这种模型中，在物质和标量场之间的非最小耦合应强烈耦合，以便在较晚的时间内加速宇宙的膨胀。我们还通过在变色龙模型的背景下获得地球偏差方程来研究平行大地测量学的相对加速。然后，通过无效偏差矢量场，我们获得了观察者区域距离作为可测量数量的可测量数量，以将模型与其他相关模型进行比较。
While considering the chameleon scalar field model with the spatially flat FLRW background, we investigate the late-time acceleration phase of the universe, wherein we apply the typical potential usually used in this model. Through setting some constraints on the free parameters of the model, we indicate that the non-minimal coupling between the matter and the scalar field in such a model should be strongly coupled in order to have an accelerated expansion of the universe at the late-time. We also investigate the relative acceleration of the parallel geodesics by obtaining the geodesic deviation equation in the context of chameleon model. Then, through the null deviation vector fields, we obtain the observer area-distance as a measurable quantity to compare the model with other relevant models.
