论文标题
超级踢和动量密度测试通过微观计算
Superkicks and momentum density tests via micromanipulation
论文作者
论文摘要
在选择电磁场的局部动量密度和角动量密度（或实际上是任何非量表场）的局部动量密度和角动量密度时，存在一个不稳定的问题。如果只检查平面波，则问题是毫无意义的，因为已知的可能表达式都给出了相同的结果。动量和角动量密度表达通常是从lagrangian获得的能量弹药张量的。通过规范程序获得的电动力表达与对称的Belinfante重新加工不同。例如，对于物质与结构光的相互作用，例如扭曲的光子，这很重要。在小型测试对象上引起的力和角动量的预测截然不同。我们显示可以检查两个预测的情况，并对效果的大小进行数值估计。
There is an unsettled problem in choosing the correct expressions for the local momentum density and angular momentum density of electromagnetic fields (or indeed, of any non-scalar field). If one only examines plane waves, the problem is moot, as the known possible expressions all give the same result. The momentum and angular momentum density expressions are generally obtained from the energy-momentum tensor, in turn obtained from a Lagrangian. The electrodynamic expressions obtained by the canonical procedure are not the same as the symmetric Belinfante reworking. For the interaction of matter with structured light, for example, twisted photons, this is important; there are drastically different predictions for forces and angular momenta induced on small test objects. We show situations where the two predictions can be checked, with numerical estimates of the size of the effects.
