So say I smash a glass plate on a chess board much larger than the plate. Simplistically, say entropy is the number of ways of rearranging the glass pieces across the squares of the board. Over time, it's likely that entropy increases since the glass would spread out, meaning each configuration would be just one combination. But in theory, it is still possible that the entropy can decrease (just an infintestimally low chance). However if the chess board expands in size until the glass pieces are no longer in causal contact with each other, then there is no probability( not even in theory) that the entropy would decrease. So macroscopically, we see that entropy does get driven up by the expansion of space. Is this true? But what about microscopically? Could the expansion of space at the level of atoms slightly affect the trajectories of particles so that the probabilty of re entering the original configuration with each small increment of time is slightly lower?