Determination of shear forces inside the proton

2021/04/05 by V. D. Burkert, Burkert, V. D., L. Elouadrhiri +3 · 1 voice · 4 citations
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High Energy Physics - Lattice (hep-lat) #High Energy Physics - Phenomenology (hep-ph) #Nuclear Experiment (nucl-ex) #Nuclear Theory (nucl-th) #hep-ex #hep-lat #hep-ph #nucl-ex #nucl-th

paper · pdf · doi:10.48550/arxiv.2104.02031

arxiv published 2021/04/05 · arxiv updated 2021/04/09

Abstract

We report on the first determination of the shear forces quarks inside the proton from experimental data on deeply virtual Compton scattering. The maximum shear force of approximately 40 MeV/fm occurs near 0.6 fm from the proton center, indicating where confinement forces may be strongest. On the macroscopic scale of the earth surface, this force corresponds to the weight of a mass of about 650 kg. The shear forces in the proton reverse direction at r = 0.45 fm from the center.

Cited by

• Gravitational form factors of the nucleon in the Skyrme model based on scale-invariant chiral perturbation theory
• Reflections on Noether's second theorem and the energy-momentum tensor
• Violation of energy conditions and the gravitational radius of the proton
• Mechanical form factors and densities of non-relativistic fermions

Discussions

• The smaller nuclear charge radii of $^3\mathrm{H}$ / $^4\mathrm{He}$ compared to $^2\mathrm{H}$ / $^3\mathrm{He}$ is because: They have so few constituent nucleons that The volume of those constituent [stackexchange, 3 points]

Related

• Mechanical properties of the nucleon from the generalized parton distributions
• Mechanical properties of proton using flavor-decomposed gravitational form factors
• Proton Gravitational Structure and Mass Decomposition on the Light Front
• The mechanical radius of the proton
• A Journey of Seeking Pressures and Forces in the Nucleon