Spatial densities of the photon on the light front
Spatial densities of the photon on the light front
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DOI：
10.1103/physrevd.106.114014
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发表时间：
2022-07
影响因子：
5
通讯作者：
A. Freese;W. Cosyn
中科院分区：
文献类型：
--
作者：
A. Freese;W. Cosyn
计算了光子在自由态和量子电动力学中的前沿动量密度、角动量密度和内压密度。在后一种情况下，我们还将形状因子分解为光子和电子的贡献。圆偏振光和线偏振光都被认为是，后者包含显着的方位角调制的动量密度和内在应力。我们发现光子的D项是正的而不是负的，相应地光子的内禀径向压力是负的。尽管如此，光子施加的辐射压力是正的。我们通过显式计算说明了与D项相关的内禀压力和光子施加的辐射压力是不同的量。
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.