Nucleon gravitational form factors in AdS/QCD

by Yang Li (University of Science and Technology of China)

Wednesday Jul 2, 2025, 9:00 PM → 10:30 PM Asia/Shanghai

ABSTRACT: The gravitational form factors (GFFs) provide crucial insights into the distribution of the strong force within hadrons and are also directly connected to the trace anomaly, which accounts for the proton's finite mass and the pion's nearly vanishing mass. However, in AdS/QCD in 5D, the tracelessness of the gravitational wave has posed a long-standing challenge in accessing hadronic GFF D-term. Here, we present a novel approach to compute these observables within the AdS/QCD framework by leveraging the remarkable correspondence between semiclassical light-front QCD and semiclassical field theories in a wrapped five-dimensional spacetime. This method is made possible through light-front holography, which seamlessly connects high-energy physics at large $Q^2$, governed by perturbative QCD, with low-energy physics at small $Q^2$, where couplings to scalar and tensor glueballs dominate. As a practical application, we calculate the GFFs for both the pion and the nucleon, and compare the results with recent lattice simulations.

 

 

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https://zoom.us/j/99220004594?pwd=zma4GsLmRQ9A6NPwgu6tOKnaNazBhC.1

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