Spatial densities of the photon on the light front

Abstract

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.

20 pages, 5 figures

References in corpus (14)

• Gravitational Form Factors of Vector Mesons in an AdS/QCD Model
• Defining the Proton Radius: a Unified Treatment
• On LHCb pentaquarks as a baryon-psi(2S) bound state -- prediction of isospin 3/2 pentaquarks with hidden charm
• Ambiguities in the definition of local spatial densities in light hadrons
• Forces inside the nucleon on the light front from 3D Breit frame force distributions: Abel tomography case
• The energy-momentum tensor of spin-1 hadrons: formalism
• On the definition of local spatial densities in hadrons
• Effects of long-range forces on the D-term and the energy-momentum structure
• Deeply Virtual Compton Scattering on a Photon and Generalized Parton Distributions in the Photon
• The gravitational form factor D(t) of the electron
• Analyticity and sum rules for photon GPDs
• Scale symmetry breaking, quantum anomalous energy and proton mass decomposition
• Spatial densities of momentum and forces in spin-one hadrons
• Diphoton Generalized Distribution Amplitudes

Cited by in corpus (7)

• Mechanical structure of a spin-1 particle
• Spatial densities of momentum and forces in spin-one hadrons
• Gravitational transition form factors of $N\to \Delta$ via QCD light-cone sum rules
• Quantum stresses in the hydrogen atom
• A Journey of Seeking Pressure and Forces in the Nucleon
• Mechanical form factors and densities of non-relativistic fermions
• Energy momentum tensor on and off the light cone: exposition with scalar Yukawa theory