I had a thought a while ago, but it was removed because I cited a youtube video of physicists talking rather than papers, so I'll have another go. My thought was that the universe could be cyclical and infinite even if heat death is the eventual end of the universe as we know it. During the big bang, inflation could have caused virtual particles to not be able to annihilate each other because space expanded faster than light (Hawking radiation.) The universe is known to be expanding and accelerating because of dark energy. When calculating all of the known forces out (fully aware that our understanding of the universe is incomplete,) we determine that the universe should die of heat death with entropy increasing to the maximum and space expanding forever. So that brings me to my question: if dark energy causes the universe to expand faster and faster, eventually, shouldn't it get to such a degree that it's expanding faster than light again? It this point, wouldn't the virtual particles that are constantly created and destroy be unable to destroy each other and suddenly fill the universe with gamma rays and basically start the whole of cosmic evolution again?