I'm admittedly an armchair scientist... I believe I was quoted at one point as saying "well special relativity is just a THEORY, so it could be wrong" which was met at the time with a snarl from someone who kinda knew that stuff better than me.
Here's my layman's question: What if our perception and measurement of time is simply is flawed and time is really a function of how much the universe has expanded? Put another way; assuming that universe is expanding at a (mostly) constant rate, might time not be an independent dimension, but simply derivable from the difference in size of the universe?
If this is actually true, then isn't time travel really a lot less complicated? Don't we immediately remove paradoxes like "if I go back in time and kill my father will I ever be born?".
What it might mean is that time is not really some thing that exists independent of the spacial dimensions, but is simply a function of an underlying effect we don't yet fully understand.
Any physicists out there who could explain how to prove/disprove this idea?