标题： 关于将当今的真空能量与驱动膨胀的势能识别为同一事物的研究 显示英文标题

标题： On Identifying the Present-Day Vacuum Energy with the Potential Driving Inflation

摘要： 存在越来越多的观测证据支持当前时代非零的宇宙学常数。我们研究了这样一个项可能直接来源于驱动早期宇宙膨胀的势能的可能性。为了避免在各个时代该势能形状的任意改变，有必要在系统中引入时间相关的黏性。标量张量理论中有效普朗克质量的演化是这种效应的一个自然候选者。在这些模型中，来自宇宙微波背景各向异性、大尺度星系结构、原始氦丰度观测以及广义相对论太阳系检验的观测限制是存在的。衰减幂律和指数势被考虑，但对于这些模型，同时满足所有限制是非常困难的。这可能对引力常数和宇宙学常数的共同演化有影响。 显示英文摘要

摘要： There exists a growing body of observational evidence supporting a non-vanishing cosmological constant at the present epoch. We examine the possibility that such a term may arise directly from the potential energy which drove an inflationary expansion of the very early universe. To avoid arbitrary alterations in the shape of this potential at various epochs it is necessary to introduce a time-dependent viscosity into the system. The evolution of the effective Planck mass in scalar-tensor theories is a natural candidate for such an effect. In these models there are observational constraints arising from anisotropies in the cosmic microwave background, large-scale galactic structure, observations of the primordial Helium abundance and solar system tests of general relativity. Decaying power law and exponential potentials are considered, but for these models it is very difficult to simultaneously satisfy all of the limits. This may have implications for the joint evolution of the gravitational and cosmological constants.