Apparent fine tunings for field theories with broken space-time symmetries
Apparent fine tunings for field theories with broken space-time symmetries
复制标题
对时空对称性破缺的场论进行明显的微调
作者：
Alberto Nicolis;I. Rothstein
我们展示了一类有效的场论，有层次小威尔逊系数的运营商，不受对称性，但没有微调。这些理论拥有打破时空对称性的有界目标空间和真空。我们给出了这些理论的物理解释为广义固体与开放的边界条件。我们表明，这些理论实现不寻常的RG流，高维（看似无关）运营商成为相关的，即使在弱耦合。最后，我们提出了一个例子的场论，其真空能量松弛到一个层次的小值相比，紫外线截止。
We exhibit a class of effective field theories that have hierarchically small Wilson coefficients for operators that are not protected by symmetries but are not finely tuned. These theories possess bounded target spaces and vacua that break space-time symmetries. We give a physical interpretation of these theories as generalized solids with open boundary conditions. We show that these theories realize unusual RG flows where higher dimensional (seemingly irrelevant) operators become relevant even at weak coupling. Finally, we present an example of a field theory whose vacuum energy relaxes to a hierarchically small value compared to the UV cut-off.