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Now lets say that you slow the speed of light down to a snales pace across the universe. Does that mean that time changes or that the whole universe will now reverse time? No. Why? Because light (the particle) is not the key to time travel per se (I will explain the exeption in a sec), it is the speed you are wanting. Basically using this model, the only noticable difference is that whereas now when we look through a telescope and see events from millions of years ago, we would see events from even longer ago.
What you are saying is mildly based on what Einstein speculated in his Relativity theory. The thought here is that when you begin accelerating towards the speed of light, things appear to be moving slower, and the speculation is that if you reach the speed of light you might view things moving backwards. However, it is just that, viewing light. You can only view the light that is traveling at X speed. So, in your case the only light change you would notice would be the light you managed to slow down, but not the high speed light that is common to us all. Once again this is due to the fact that the speed, not the particle, is what matters. When Einstein used the speed of light, he merely meant it as a reference to the fastest thing known. However, we now know that light is not the fastest thing out there. He referenced its speed, not the particle.
Now there is an execption when dealing with the tremendous speed of photons and time travel. Let's say that you could open a wormhole. You give one person one end and you shoot off away from them at a high rate of speed, you can use the speed of light or whatever here. Your time and speed begin to have a noticable inverse effect on one another (noticable to the 3rd observer outside the vacuum of our experiment). To the third observer there is a change in time, being that your time moves slower and slower and the person at the origin's time moves at a constant and seemingly unchanging rate.
You travel say 1 year at velocities close to 299,792,458 m/s. While you look in your end of the wormhole, you see time speeding past, as though you are watching a vcr tape on high speed. The orgin observer views you through the wormhole as moving extremely slow. When you come back to the point of origin much more time has passed there than has with you. Now rewind for a sec all the way back to when you are travelling very fast. You look through the wormhole and see things at the origin moving really fast. You step through, to you this would appear that you have gone back in time. If the person at the origin steps through to you, he will have gone forward, somewhat, in time. Is this time travel? Yes and now. I prefer to call it shifting time frames, since you cannot go back in time to an event you witnessed in the wormhole and change it. Once the event has passed, you cannot accelerate faster than light and go back and change Y event. Simply put, you can't "rewind" the tape from either end.
Now, the question arises, what if I keep accelerating towards infinity will events ever go backwards or stop? The answer is no. The reason why is as you approach infinity, your time slows towards 0, but never reaches 0 nor does it go to negative. The light may appear to reverse once you pass the particle's given speed, but time never stops or goes in reverse. So if you step through the wormhole you will be in the timeframe of the person holding the wormhole end, not in their past. Theory is based in the fact that you can continue to accelerate at a speed that time will continue to half it's original rate whilst never reaching 0. I.E. take one inch and divide it in half, divide that half into halves, and so forth and you will never reach zero. The same principle applies to the inverse relationship between the rate of speed and time.
Well, that is my take on your theory. It is very logically thought out. I look forward to reading your insights in the future.
), thus giving and infinite number of 'world's, forward an backwards. We are just one of them.