一个球形标量-张量星系模型
A spherical scalar-tensor galaxy model
摘要：
我们建立了一个星系的球晕模型，使用一般的标量张量引力理论在其牛顿极限。标量场由一个与时间无关的Klein-Gordon方程描述，该方程与牛顿引力的标准泊松方程耦合。我们的模型，通过建设，既适合观察到的旋转速度的恒星螺旋和一个典型的光度分布。结果确定了新牛顿势的形式、星系中的标量场和暗物质分布。考虑到理论的基本参数（λ，α）的约束，我们分析了标量场的影响，在暗物质分布，导致在银河系中心的浅密度剖面。
英文摘要：
We build a spherical halo model for galaxies using a general scalar-tensor theory of gravity in its Newtonian limit. The scalar field is described by a time-independent Klein-Gordon equation with a source that is coupled to the standard Poisson equation of Newtonian gravity. Our model, by construction, fits both the observed rotation velocities of stars in spirals and a typical luminosity profile. As a result, the form of the new Newtonian potential, the scalar field, and dark matter distribution in a galaxy are determined. Taking into account the constraints for the fundamental parameters of the theory (lambda,alpha), we analyze the influence of the scalar field in the dark matter distribution, resulting in shallow density profiles in galactic centers.
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