论文标题
量子重力中的非扰动单位性和虚拟幽灵
Non-perturbative unitarity and fictitious ghosts in quantum gravity
论文作者
论文摘要
我们讨论量子场理论中非扰动单位性的方面。在有限的衍生品有限秩序的“截断”中产生的其他幽灵自由程度可能是虚构的自由度。一旦所有操作员与理论的对称性兼容，它们都会消失对完全穿透的繁殖物的贡献 - 相应的类似鬼极的残基消失。这些“假幽灵”并不表示违反了单位性。
We discuss aspects of non-perturbative unitarity in quantum field theory. The additional ghost degrees of freedom arising in "truncations" of an effective action at a finite order in derivatives could be fictitious degrees of freedom. Their contributions to the fully-dressed propagator -- the residues of the corresponding ghost-like poles -- vanish once all operators compatible with the symmetry of the theory are included in the effective action. These "fake ghosts" do not indicate a violation of unitarity.
