Sine-Gordon模型中的量子猝灭：半经典方法
Quantum quenches in the sine--Gordon model: a semiclassical approach
摘要：
我们计算的时间演化的关联函数量子猝灭后的正弦-戈登模型内的半经典近似，预计将产生准确的结果，为小猝灭。我们证明了这一点，最近的形状因子计算放松的期望值的再现结果。推广这些结果，我们发现大多数顶点算子的期望值不会衰减到零。我们给出了动态关联函数弛豫的解析表达式，并证明了它们对大类时分离具有扩散行为。
英文摘要：
We compute the time evolution of correlation functions after quantum quenches in the sine--Gordon model within the semiclassical approximation which is expected to yield accurate results for small quenches. We demonstrate this by reproducing results of a recent form factor calculation of the relaxation of expectation values. Extending these results, we find that the expectation values of most vertex operators do not decay to zero. We give analytic expressions for the relaxation of dynamic correlation functions, and we show that they have diffusive behavior for large timelike separation.
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