Universal renovation theory

This is a quickly synthetization of my thoughts, a reasoning of the universe's life and death, again and again, based on the big bang theory.

The universe was born from an explosion, we call it "Big Bang", and that explains why the universe is expanding, and why the universe is hot in some places, because de movement of energy. It is known that sometime the universe will "die", we call it "entropy", but, what's the entropy? Well, the entropy is a point in time where there is no energy, all the matter is inactive and cold. You'll be asking... But, the energy can't be lost, it just change his composition. The universe is infinite, and all the energy ends becoming caloric energy, and de caloric energy tends to scatter all over the infinite space, and that's practically lost energy.

So.. said that, we are sure that the entropy is going to occur someday, and what's left behind the entropy, the only force that can affect space-time, the gravity. We know that all the matter, whatever its size, has gravity, and after the entropy, when all the matter is inactive, the gravity will act all over de universe and it will begin to attract each piece of matter, until all the matter stacks on a supermassive black hole, because of his mass, it will collapse over itself, and when the black hole is fully loaded at its max capacity, it will explode, and again, the universe will be born with another "Big Bang".

Repeting this process for ever.