论文标题
光线上光子的空间密度
Spatial densities of the photon on the light front
论文作者
论文摘要
在自由情况下和量子电动力学的领先顺序中，计算了光子的动量，角动量和内在压力的光前密度。在后一种情况下，我们将形式因子分解为光子和电子贡献。都考虑了循环和线性极化的光子，后者在动量密度和内在应力中都包含显着的方位角调制。我们发现光子的D期限为正，而不是负，因此光子的固有径向压力为负。尽管如此，光子施加的辐射压力为正。我们通过显式计算说明与光子施加的固有压力与D-Term和辐射压力相关的固有压力是不同的数量。
The light front densities of momentum, angular momentum, and intrinsic pressure are calculated for the photon, both in the free case and at leading order in quantum electrodynamics. In the latter case, we moreover decompose the form factors into photon and electron contributions. Circularly and linearly polarized photons are both considered, with the latter containing significant azimuthal modulations in both the momentum density and in intrinsic stresses. We find that the D-term of the photon is positive instead of negative, and accordingly the intrinsic radial pressure of the photon is negative. Despite this, the radiation pressure exerted by the photon is positive. We illustrate through explicit calculation how the intrinsic pressure associated with the D-term and the radiation pressure exerted by the photon are different quantities.
