If the universe continues to expand and cool, after trillions of years all matter will eventually evaporate. That's the theory. But if all matter disappears, what happens to gravity? There wouldn't be any! AFAIK that violates conservation of information.

And what about the big bang? Why would a mass so immense and so densely packed EXPAND? Why wouldn't it just collapse forever under it's own weight into a black hole? This might suggest there is a maximum density for matter, before it explodes.

But why would it explode? What if dark matter acted as a flywheel, storing gravitational energy for galaxies which inevitably coalesce and collapse. Then as the event horizon forms, a critical density is reached, supersymmetry is re-established, and all gravitational energy is instantly transferred from dark matter to the black hole, and it explodes.

Opinions?