论文标题
F（R，T）重力理论中螺旋星系和暗物质的银河旋转曲线
Galactic rotation curves of spiral galaxies and dark matter in f(R,T) gravity theory
论文作者
论文摘要
银河旋转曲线是银河系中重力场状态的强大指标。这些曲线的平坦度表明星系中存在暗物质及其簇。在本文中，我们着重于解释螺旋星系的旋转曲线而不假设在$ f（\ Mathcal {r}，t），t）$重力的框架中存在暗物质的存在，其中重力lagrangian在其中以$ \ natercal {r} $的任意功能编写了$ \ ricci callim的$ \ ricci callim trackorts $ um t $ t $ t $ t $ t $ t $ t $ t $ t $ t $ $ t_ {μν} $。我们为静态球形时空的重力理论中的重力场方程得出了重力场方程，并使用特定模型在物质和几何形状之间具有最小的耦合来求解方程计量系数。考虑了在稳定的圆形轨道中移动的巨大测试粒子的轨道运动，并研究了其切向速度的行为，借助于考虑的模型。我们通过生成测试粒子的旋转曲线和拟合旋转曲线来检查模型的生存能力，将模型预测的理论结果与观察到的19个星系样本进行比较。观察到，该模型几乎可以成功解释这些星系的银河系动力学，而无需在离银河中心大距离的暗物质。
Galactic rotation curve is a powerful indicator of the state of the gravitational field within a galaxy. The flatness of these curves indicates the presence of dark matter in galaxies and their clusters. In this paper, we focus on the possibility of explaining the rotation curves of spiral galaxies without postulating the existence of dark matter in the framework of $f(\mathcal{R},T)$ gravity, where the gravitational Lagrangian is written by an arbitrary function of $\mathcal{R}$, the Ricci scalar and of $T$, the trace of energy-momentum tensor $T_{μν}$. We derive the gravitational field equations in this gravity theory for the static spherically symmetric spacetime and solve the equations for metric coefficients using a specific model that has minimal coupling between matter and geometry. The orbital motion of a massive test particle moving in a stable circular orbit is considered and the behavior of its tangential velocity with the help of the considered model is studied. We compare the theoretical result predicted by the model with observations of a sample of nineteen galaxies by generating and fitting rotation curves for the test particle to check the viability of the model. It is observed that the model could almost successfully explain the galactic dynamics of these galaxies without the need of dark matter at large distances from the galactic center.
