标题： 广义标量-张量引力中的玻色子星：平衡构型 显示英文标题

标题： Boson Stars in General Scalar-Tensor Gravitation: Equilibrium Configurations

摘要： 我们研究了在广义标量-张量引力理论框架下的玻色子星的平衡构型。 我们分析了几种可能的耦合方式，具有可接受的弱场极限，并且在已知的情况下，有核合成限制，以便在这种类型的理论中处于更符合宇宙学现实的情况。 我们发现，对于一般的标量-张量引力，玻色子星可能具有的质量范围与广义相对论情况相当。 我们还分析了玻色子星在宇宙演化不同时期的形成可能性，允许远离恒星的有效引力常数偏离其当前值。 在这些情况下，我们发现玻色子星的质量对这种变化非常敏感，通常在几个百分点以内。 我们还研究了耦合通过径向坐标依赖关系隐式定义的情况，允许它在结构半径内有显著的变化。 显示英文摘要

摘要： We study equilibrium configurations of boson stars in the framework of general scalar-tensor theories of gravitation. We analyse several possible couplings, with acceptable weak field limit and, when known, nucleosynthesis bounds, in order to work in the cosmologically more realistic cases of this kind of theories. We found that for general scalar-tensor gravitation, the range of masses boson stars might have is comparable with the general relativistic case. We also analyse the possible formation of boson stars along different eras of cosmic evolution, allowing for the effective gravitational constant far out form the star to deviate from its current value. In these cases, we found that the boson stars masses are sensitive to this kind of variations, within a typical few percent. We also study cases in which the coupling is implicitly defined, through the dependence on the radial coordinate, allowing it to have significant variations in the radius of the structure.