标题： 量子引力对精细结构常数的预测 显示英文标题

标题： Quantum-gravity predictions for the fine-structure constant

摘要： 引力的渐近安全量子涨落可以唯一确定一大类大统一模型的规范耦合常数。 反过来，这使得电磁精细结构常数可计算。 引力和物质涨落的平衡导致规范耦合常数的运行出现一个固定点。 当动量尺度在普朗克尺度以上区域降低时，会接近这个固定点，从而在普朗克尺度上唯一地预测规范耦合常数的值。 所预测的精细结构常数的精确值取决于大统一模型的物质内容。 它与引力涨落效应成正比，而这些效应的计算不确定性仍有待解决。 显示英文摘要

摘要： Asymptotically safe quantum fluctuations of gravity can uniquely determine the value of the gauge coupling for a large class of grand unified models. In turn, this makes the electromagnetic fine-structure constant calculable. The balance of gravity and matter fluctuations results in a fixed point for the running of the gauge coupling. It is approached as the momentum scale is lowered in the transplanckian regime, leading to a uniquely predicted value of the gauge coupling at the Planck scale. The precise value of the predicted fine-structure constant depends on the matter content of the grand unified model. It is proportional to the gravitational fluctuation effects for which computational uncertainties remain to be settled.