Genuine empirical pressure within the proton

A phenomenological extraction of forces within the proton has recently been performed using JLab CLAS data V. D. Burkert et al., [arXiv:2104.02031]. The extraction used a three-dimensional Breit frame description in which the initial and final proton states have different momenta. Instead, we obtain the two-dimensional (2D) transverse light front pressure densities that incorporate relativistic effects arising from the boosts that cause the initial and final states to differ. Taking the CLAS results seriously, we obtain a 2D mechanical radius for the proton. Additionally, we find predominantly repulsive forces near the proton's center, and predominantly attractive forces further out.