For the electric forces, opposite charges attract, like charges repel. For magnetic forces opposite poles attract and like charges repel. But for gravitational forces, matter attracts matter. What about the gravitational forces between matter and antimatter? What about the gravitational forces between antimatter and antimatter?
Does antimatter gravitationally attract other antimatter? Does matter gravitationally attract or repel antimatter? We believe that matter and antimatter pairs will destroy each other on contact. We believe that matter and antimatter pairs appear to be randomly created.
Let’s assume that in the Big Bang equal amounts of matter and antimatter were formed at the same time. Where is the antimatter? Why didn’t the matter and antimatter annihilate each other?
Let’s assume that antimatter attracts antimatter like matter attracts matter. This means we would have antimatter atoms, molecules, planets, stars, black holes, etc. similar to what we see with matter. There would be solar systems of antimatter like our solar systems of matter.
If matter and antimatter attracted one another or did not have any gravitational effect on each other, they could coexist in close proximity. We might see antimatter planets in matter solar systems. We might see antimatter solar systems and matter solar systems in the same galaxy. If this were the case, it seems like we would have discovered nearby antimatter in our solar system. Also, the mutual annihilation of matter and antimatter would be common.
If we assume that matter repels antimatter, many of these issues can be resolved. Antimatter could still form antimatter atoms, molecules, planets, stars, black holes, etc., but they would be repelled by matter. This would maintain a balance and prevent the mutual annihilation of matter and antimatter in the universe.
Now there is another consideration. It has been determined that light is bent due to gravitational force. It behaves like matter and is attracted to matter. This makes sense since light and other EM waves are produced by matter.
What about light produced by antimatter? Would antimatter light react like antimatter? If so, that means antimatter EM waves would be repelled by matter and attracted to antimatter. So, there would be some basic difference between the two types of EM waves.
It would be interesting to compare matter EM waves and antimatter EM waves. We know that matter produces and interacts with associated EM waves. Let’s assume that antimatter produces and interacts with associated EM waves. If the matter and antimatter EM waves ARE different, could matter detect antimatter EM waves? Could antimatter be used to detect matter EM waves?
What if we could not detect antimatter EM waves using matter? This might mean that when we view the universe we only see the matter in the universe and not the antimatter. Could antimatter EM waves be invisible to us poor matter beings?
Maybe we need to change the Conservation of Mass and Energy Law to the Conservation of Matter mass/energy and Antimatter mass/energy. Matter mass and associated EM waves would be positive and antimatter mass and associated energy would be negative. That might give us a zero sum for all mass and energy in the universe.