标题： 动量依赖的场重定义在渐近安全中 显示英文标题

标题： Momentum-dependent field redefinitions in Asymptotic Safety

摘要： 我们讨论在量子引力散射振幅的一般背景下，特别是渐近安全性的背景下，一般的动量依赖场重定义。 在最低曲率阶次实现此类重定义，我们可以将引力子传播子带入树级形式，避免规范鬼极点及其相关的单位性破坏问题。 我们计算了牛顿常数的β函数，并发现了一个渐近安全固定点，其临界指数与不解析动量依赖场重定义的情况相比变化了$0.4\%$。 这强烈表明该固定点不包含与鬼模式相关的额外自由度，并且很可能与一个单位理论有关。 显示英文摘要

摘要： We discuss general momentum-dependent field redefinitions in the context of quantum-gravitational scattering amplitudes in general, and Asymptotic Safety in particular. Implementing such redefinitions at the lowest curvature order, we can bring the graviton propagator into tree-level form, avoiding issues of fiducial ghost poles and their associated violations of unitarity. We compute the beta function for Newton's constant, and find an asymptotically safe fixed point whose critical exponent changes by $0.4\%$ compared to not resolving the momentum-dependent field redefinition. This provides a strong indication that this fixed point does not feature extra degrees of freedom related to ghostly modes, and has a good chance of being related to a unitary theory.