The Aristotlian view is time is not a constant universally. It is specific to each person or thing in question. He uses the example of things/animals aging/decaying at different rates. Under this model of thought one could time travel only within their lifetime [the Quantum Leap example].
Another view is that time is a universal constant wherein all things are affected differently, but none are outside of it. Therefore time travel would be the momentary stepping outside of the realm of time to re-enter at another time.
As a corrolary to this it is not unreasonable that time should not react like all other natural conditions. In this for every act there should be an equal and opposite reaction. Second, there should also be decreasing returns. I know that the second is poorly stated [but my child keeps distracting me with an inflatable shark] but what it basically means is that the first time affecting act will have greater quanitative results than any attempt that follows.
I realize that these are variant and not the theories of any physicist that I know, but could be useful in a gaming world.
TTFN, Brad ------------------------------
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