多维G时间变化模型
Models of G time variations in diverse dimensions
摘要：
综述了导致有效引力常量G随时间变化相对较小的不同维度宇宙学模型。其中：四维广义标量-张量模型、两个弯曲Einstein空间的多维真空模型、多组分各向异性“理想流体”的多维模型、标量场和两种形式场的S膜模型等。本文指出，对于有效引力常量G随时间的较小变化，存在着不同的可能解释途径，与现有的宇宙学数据相一致（例如加速度）：4维标量张量理论或多维宇宙学模型与不同的物质来源。G点的实验界可能在某个限定的区间内或对同步时间变量的所有允许值都满足。
英文摘要：
A review of different cosmological models in diverse dimensions leading to a relatively small time variation of the effective gravitational constant G is presented. Among them: 4-dimensional general scalar-tensor model, multidimensional vacuum model with two curved Einstein spaces, multidimensional model with multicomponent anisotropic "perfect fluid", S-brane model with scalar fields and two form field etc. It is shown that there exist different possible ways of explanation of relatively small time variation of the effective gravitational constant G compatible with present cosmological data (e.g. acceleration): 4-dimensional scalar-tensor theories or multidimensional cosmological models with different matter sources. The experimental bounds on G-dot may be satisfied ether in some restricted interval or for all allowed values of the synchronous time variable.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
