线性区中的超光速旅行、UV/IR混合和Turbulence
Superluminal Travel, UV/IR Mixing and Turbulence in the Lineland
摘要：
我们研究了具有瞬时因果结构（光锥时间序诱导的因果序）的二维时空中可重整化的洛伦兹不变稳定量子场论。这些模型提供了一个候选的UV-完成的二维鬼凝聚。它们表现出一种特殊的UV/IR混合-所有激发的能量在高空间动量下变得任意小。我们讨论了与这种混合相关的几种现象。这些包括不可能达到热平衡和亚稳态的所有激发衰减到短波长模式，导致在一个不确定的湍流级联。尽管在许多情况下存在UV/IR混合，但UV物理仍然可以与低能现象解耦。然而，线域中耐心的观察者只要等待足够长的时间，就能产生任意重的粒子。
英文摘要：
We study renormalizable Lorentz invariant stable quantum field theories in two space-time dimensions with instantaneous causal structure (causal ordering induced by the light "cone" time ordering). These models provide a candidate UV-completion of the two-dimensional ghost condensate. They exhibit a peculiar UV/IR mixing - energies of all excitations become arbitrarily small at high spatial momenta. We discuss several phenomena associated with this mixing. These include the impossibility to reach a thermal equilibrium and metastability of all excitations towards decay into short wavelength modes resulting in an indefinite turbulent cascade. In spite of the UV/IR mixing in many cases the UV physics can still be decoupled from low energy phenomena. However, a patient observer in the Lineland is able to produce arbitrarily heavy particles simply by waiting for a long enough time.
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