We have investigated some cosmological consequences of variation of the fine structure constant, α, in the context of the Bekenstein-Sandvik-Barrow-Magueijo (BSBM) model. In this context, such a variation is attributed to the electric charge by letting the latter take on the value of a real scalar field, ϕ, which varies generally in space and time. We consider the dynamics of ϕ in the case that it is allowed to have an exponential potential. We have found solutions for evolutions of ϕ and α in the radiation and the matter dominated eras. By employing observational bounds on the temporal variation of α, we constrain the model parameters. We then investigate the impact of α-variation on the redshift dependence of the CMB temperature. It is shown that there is a deviation from the standard evolution of the temperature which contains two different contributions, one is important at high-redshift eras and the other is mostly effective at low-redshift eras.

我们已经在 Bekenstein-Sandvik-Barrow-Magueijo (BSBM) 模型的背景下研究了精细结构常数α变化的一些宇宙学后果。在这种情况下，这种变化归因于电荷，让后者采用实标量场ϕ的值，该值通常在空间和时间上变化。我们考虑ϕ在允许具有指数潜力的情况下的动力学。我们已经找到了辐射和物质主导时代ϕ和α演化的解。通过对α的时间变化采用观察界限，我们约束了模型参数。然后我们调查影响α - CMB 温度红移依赖性的变化。结果表明，温度的标准演化存在偏差，其中包含两种不同的贡献，一种在高红移时代很重要，另一种在低红移时代最有效。