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arXiv 2007.08805hep-thgr-qchep-lat
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基本标度不变性

Fundamental Scale Invariance

C. Wetterich

摘要:

我们提出了基本尺度不变性作为一个新的理论原理超越重整化。具有基本标度不变性的量子场论承认泛函积分和有效作用量在标度不变性场中的无标度表述。它们对应于泛函重整化流方程的精确标度解。这样的理论是高度预测,因为所有相关参数的偏差从精确的缩放解决方案消失。现实的粒子物理学和量子引力与此设置兼容。标度解的非线性限制可以解释渐近消失的宇宙学常数或动力学暗能量的性质,从微扰的观点来看,这似乎需要微调参数。作为一个例子,我们讨论了一个预几何的基础上的一个同态不变杨米尔斯理论。它是一个候选的紫外完成的量子引力与一个行为良好的引力子传播在短距离。

英文摘要:

We propose fundamental scale invariance as a new theoretical principle beyond renormalizability. Quantum field theories with fundamental scale invariance admit a scale-free formulation of the functional integral and effective action in terms of scale invariant fields. They correspond to exact scaling solutions of functional renormalization flow equations. Such theories are highly predictive since all relevant parameters for deviations from the exact scaling solution vanish. Realistic particle physics and quantum gravity are compatible with this setting. The non-linear restrictions for scaling solutions can explain properties as an asymptotically vanishing cosmological constant or dynamical dark energy that would seem to need fine tuning of parameters from a perturbative viewpoint. As an example we discuss a pregeometry based on a diffeomorphism invariant Yang-Mills theory. It is a candidate for an ultraviolet completion of quantum gravity with a well behaved graviton propagator at short distances.

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