Dark matter is a guess that has not been discovered. Gravity is a force created by matter. The problem scientists are running into is they cannot explain the acceleration of the speeds at which galaxies are moving away from each other. It is like something is pulling apart the local 45 billion light year diameter globe we are in. I wonder if their is an intense energy field outside of that globe pulling us apart.
Isn't this expansion thought to be a continuing feature of The Big Bang?
That does not explain the acceleration. Big Bang doesn't even hold up very well. Big Bang still pulls a Harry Potter to bring energy into existence and the timelines built always turn out to be wrong. The age of the universe was once thought to be the distance we could see which was about 14 billion light years but new evidence points to at least 42 billion light years.
No. This is fiction made by scientists who cannot explain what is going on. Gravity is a force, not an energy.
Energy produces gravitational attraction to other energy. The attraction is not energy itself. Light does not produce more light. E=mc^2. There is no gravitron.
No. You are falling into the quantum physics trap of failing to keep up with the characteristics of your particles. Quantum particles are not all made up of energy. Sometimes they are just space. Produce is a poor word to use. Gravity simply is. It is not produced. It was always in play and will always be in play. You cannot make gravity, you can only move energy to change the sum total gravity vector. Making gravity is making energy and you can do neither. Because energy is neither created nor destroyed, big bang blows itself up. I should have said energy has gravitational attraction to other energy so you could understand what is really happening. Noise is tricking your thinking on the matter.
Energy will always have gravity. It does not have to be in the form of mass. Light has gravity. What is driving the orbital speeds of energy in a galaxy is still a bit of a mystery.