论文标题
在宇宙弦周围的高衍生标量场理论中应力张量的量子波动
Quantum fluctuation of stress tensor in a higher-derivative scalar field theory around a cosmic string
论文作者
论文摘要
我们计算围绕薄宇宙弦的高衍生理论的应力张量的真空波动。为此，我们采用了从Gibbons等人开发的有效作用中获得应力张量的方法。通过他们的方法，没有自我相互作用的高衍生标量理论的量子应力张量表示为简单的自由大规模标量场的量子应力张量。与在类似模型中获得的标量平方的真空预期值不同，锥形奇异性附近的值似乎没有降低。
We calculate the vacuum fluctuation of the stress tensor of a higher-derivative theory around a thin cosmic string. To this end, we adopt the method to obtain the stress tensor from the effective action developed by Gibbons et al. By their method, the quantum stress tensor of higher-derivative scalar theories without self-interaction is expressed as a simple sum of quantum stress tensors of free massive scalar fields. Unlike the vacuum expectation value of the scalar field squared obtained in the similar model, there appears no reduction of the values near the conical singularity.
