Probing the gravitational form factors from near threshold heavy quarkonium photoproduction

I will talk about the recent development on the exclusive near threshold photoproduction of heavy quarkonium in the generalized parton distribution (GPD) framework. I will discuss the relation between the Compton-like amplitudes, especially their real parts, and the gravitational form factors that are crucial for the understanding of the mechanic properties and higher-dimensional structure of the nucleon. Utilizing recent measurements of near-threshold J/psi photoproduction, I will describe how such a framework can be tested with these measurements and allows for the potential extraction of the gluonic gravitational form factors from them.