I have tried as hard as I am able to get a grasp on the complex laws of physics that define our universe, though I'm sure my knowledge of the subject is actually quite minuscule. I have been wanting to begin work on a sci-fi novel, however I'm determined to think of my own unique (at least relatively) form of FTL travel before I do. I have theorized that light's speed limit could be set by ever present cold dark matter, it seems this could be plausible as i recall reading somewhere that light travels slightly faster in some parts of the universe than in others (where there could be an unusually low amount of cold dark matter.) I don't want to get too attached to this theory as the basis for my FTL travel if it's simple nonsense, but I'm not a physics master so I'm not sure.
Could someone tell me if this theory is at least plausible? If not could you explain what is that does define light's static speed limit?
Edit: Now that I'm thinking of it, since everything in physics is relative to light and we don't know what dark matter is it certainly seems as though cold dark matter could be a limiting factor. Still tell me if I'm missing something here.
I've been doing some more research and it certainly seems to remain plausible, all electromagnetic waves travel at "c" except for apparently very rare anomalies observed in space. So it travels at c, but why? Still doesn't seem to be dis-proven that cold dark matter is the culprit.
Cold dark matter doesn't interact with electromagnetism which is why it's invisible, but perhaps it interacts with it in some non-traditional or highly minuscule way?
