Sorry for the confusing title! I have a question that I cannot wrap my mind around... Suppose the universe attains its state of maximum entopy (assuming maximum here also involves quantum effects such that in the end even the atoms disintegrate into photons and leptons). I understand that in order to do work there needs to be a temperature gradient( which wont be avilable) but would'nt quantum fluctuations still persist (uncertainty principle)? So if you agree on the quantum effects(i hope you do) then would;nt 'we' in principle be able to measure time still? So doesn't that mean that the direction of time has nothing to do with the increase in entropy of the universe? i.e the thermodynamic arrow of time AND the cosmological arrow of time are distinct and unrelated entities??? Also...if the universe is still expanding after alls said and done...what exactly will be causing the expansion? Shouldnt it fade with the apparent dissapearance of gravitation and the dark stuff?? I' am sorry if I sound dumb but I sounded like a good idea to ask.