Dipankar Chakrabarti

Sampling topological quantities in the Monte Carlo simulation of lattice gauge theory becomes challenging as we approach the continuum limit (a→0) of the theory. In this work, we introduce a conditional normalizing flow model to sample U(1) gauge theory in two dimensions, aiming to mitigate the impact of topological freezing when dealing with smaller values of the U(1) bare coupling.

Abstract We formulate a light-front spectator model for the proton incorporating the gluonic degree of freedom. In this model, at high energy scattering of the proton, the active parton is a gluon and the rest is viewed as a spin-12 spectator with an effective mass. The light front wave functions of the proton are constructed using a soft wall AdS/QCD prediction and parametrized by fitting the unpolarized gluon distribution function to the NNPDF3.0nlo dataset.

Abstract We obtain the gluon parton distribution functions (PDFs) in the proton within the extended light-front holographic QCD framework, where the proton couples with the spin-2 Pomeron in anti–de Sitter space, together with constraints imposed by the Veneziano model. The gluon helicity asymmetry, after satisfying the perturbative QCD constraints at small and large longitudinal momentum regions, agrees with existing experimental measurements.