The IIB matrix model is one of the candidates for nonperturbative formulation of string theory. and it is believed that the model contains gravitational degrees of freedom in some manner. In some preceding works. it was proposed that the matrix model describes the curved space where the matrices represent differential operators that are defined on a principal bundle. https://www.diegojavierfares.com/mega-pick-McIntosh-MEN220-Room-Correction-System-clearance/