How do we know that "temporal quanta" exist?
I don’t ‘know’—as in scientifically proven; I rely upon inference ... what is it about mass (that’s an accumulation of particles) that warps spacetime? Something in the particles is responsible as they accumulate. Add to that question that ‘speed’ of an object influences the temporal passage for the object in motion—or an object caught in a gravitational field such a black hole.