标题： 标量-张量引力理论中与\PHI 有关的质量 显示英文标题

标题： Scalar--Tensor Theories of Gravity with \PHI Dependent Masses

摘要： 我们研究广义标量-张量引力理论中新的物理现象和约束，这些理论具有依赖于$\Phi$的质量。 我们研究一种场景（可能出现在弦理论中），其中包含两种依赖于$\Phi$的质量，这些质量可能对应于可见物质和暗物质领域。 该理论的参数受到后牛顿界限、原始核合成和宇宙年龄的约束。 我们为具有可变质量的暗物质领域提出了一个完美流体形式，并发现物质时代期间存在熵增加效应，原则上对螺旋星系晕的运动有可测量的影响。 对于弦有效理论的情况，规范耦合常数的恒定性提供了比以前更强几个数量级的新界限。 显示英文摘要

摘要： We study new physical phenomena and constraints in generalized scalar--tensor theories of gravity with $\Phi$--dependent masses. We investigate a scenario (which can arise in string theories) with two types of $\Phi$--dependent masses which could correspond to visible and dark matter sectors. The parameters of this theory are constrained from post--Newtonian bounds, primordial nucleosynthesis and the age of the Universe. We present a perfect fluid formalism for the dark matter sector with variable masses and find an entropy increase effect during the matter era and, in principle, a measurable effect on the motion of the halo of spiral galaxies. For the case of string effective theories, the constancy of gauge couplings provide new bounds which are orders of magnitude stronger than the previous ones.