If you reduce all energy exchange to particles in a vacuum, most of the particles transfering energy are photons. Energy transfer, in general is mostly reducibl

If you reduce all energy exchange to particles in a vacuum, most of the particles transfering energy are photons. Energy transfer, in general is mostly reducible to photons at a fundamental level. In other words, across the vacuum of space, in an idealized model, where there is nothing but void, any exchange or transfer is via particles traversing the emptiness, and most often, those particles are photons. If two bodies at absolute zero are suspended in a void, and the limits of that void are walls of matter frozen at absolute zero, light years away, and nothing in the scene is emitting photons, what reason would drive the to objects to be attracted toward one another? This is to say, if the arrow of time is a deterministic effect of entropy, and the irreversible aspect of time is a result of the chaotic interactions of many discrete subatomic entities, why would spacetime still be curved by two dark, massive, cold bodies, such that, even in the absence of photon exchange between the two, there are forces acting upon them at a distance, leading them to cross a void, travel down some unseen curvature or gradient and collide? If empty space truly is nothingness and void, then entropy, and by corollary, the arrow of time, only exists in the quantum state of each material body. This would seem to herald a fact that the bodies each move themselves toward eachother, as an incidental phenomenon of being condensed from raw unbound energy to systems of materialized standing waves, (subatomic particles trapped in fixed discrete systems of balanced energy, which does not readily decay into other particles without action from external entities). In total darkness, without the exchange of photons, why would two massive, cold, inert objects move inexorably toward one another? How would each massive object find the other's location and accelerate toward the other, if there is nothing but empty space between?