Unitarity and microscopic acausality in a nonlocal theory
Unitarity and microscopic acausality in a nonlocal theory
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非局部理论中的幺正性和微观因果关系
DOI：
10.1103/physrevd.95.045009
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发表时间：
2016
影响因子：
5
通讯作者：
C. Carone
中科院分区：
文献类型：
--
作者：
C. Carone
我们在无限阶的高导数理论中考虑统一性和因果性，其中由于动量的超越整个函数的存在，传播子在紫外中更快地脱落。与Lee-Wick理论一样，这些场理论可能为解决层次问题提供新的途径；与李-威克理论不同，树级传播子没有额外的极点，对应于未观察到的具有不寻常性质的粒子。我们在这些非局部理论中考虑微观因果关系。普通共振粒子的产生顶点和衰变顶点的因果顺序可以为这些模型提供一个现象学上不同的特征。
We consider unitarity and causality in a higher-derivative theory of infinite order, where propagators fall off more quickly in the ultraviolet due to the presence of a transcendental entire function of the momentum. Like Lee-Wick theories, these field theories might provide new avenues for addressing the hierarchy problem; unlike Lee-Wick theories, tree-level propagators do not have additional poles corresponding to unobserved particles with unusual properties. We consider microscopic acausality in these nonlocal theories. The acausal ordering of production and decay vertices for ordinary resonant particles may provide a phenomenologically distinct signature for these models.