标题： 微扰构造相干态 显示英文标题

标题： Perturbative Construction of Coherent States

摘要： 相互作用量子场论中相干态的微扰一致性要求它们超越简单的非压缩形式进行修改。 基于这一点，我们进行了符合要求的压缩相干态的显式构造，这是在单环阶次下物理量有限性所必需的。 将此分析扩展到两环阶次，我们证明了对压缩相干态进行非高斯修改是必要的。 我们提出的相干态修改在$\hbar$上是微扰的，这可能表明必须通过非线性重新定义的、背景依赖的自由度来看待相干性。 显示英文摘要

摘要： The perturbative consistency of coherent states within interacting quantum field theory requires them to be altered beyond the simple non-squeezed form. Building on this point, we perform explicit construction of consistent squeezed coherent states, required by the finiteness of physical quantities at the one-loop order. Extending this analysis to two-loops, we demonstrate that a non-Gaussian alteration of squeezed coherent states is necessary. The modifications of the coherent state we propose are perturbative in $\hbar$ and may be an indication that coherence must be viewed through a nonlinearly redefined, background-dependent, degree of freedom.