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Reversed time randomness

Name: Anonymous 2008-08-30 3:01

So assuming the viewpoint of traveling backwards through time, what happens to the random events of quantum physics? I'm thinking that stuff like radioactive decay would be a predictable event, in that you'd see the particle/ray colliding with the nucleus, popping it a place up on the decay chain.
Are there any events that are deterministic forward-time that would look non-deterministic in reverse-time? Maybe the ejection of matter from black holes?

Name: Anonymous 2008-09-07 12:54

Do some reading on something called "Time's Arrow" and Entropy.
Not to be insulting, but you seem to only have a very loose grasp on some basic concepts. I'd recommend a book called "The Fabric of the Cosmos" by Brian Greene, for a start (http://www.amazon.com/Fabric-Cosmos-Space-Texture-Reality/dp/0375412883).

Long story short, in quantum physics, the same "randomness" that prevents you from knowing the future also keeps you from knowing the past. This is why we don't (and probably can't) know what happened during or before the first 1x10^-35 seconds of the universe following the Big Bang.

Oh, and a time-reversed black hole is known as a white hole. If a black hole is in equilibrium (no Hawking radiation), it would look and behave exactly the same going in both directions in Time. If it is not in equilibrium, a white hole still exerts a normal gravity field, except matter is repelled from the event horizon at the speed of light instead of getting sucked in. Remember that gravity is acceleration and vice versa. Acceleration is distance over time over time, or d/(t^2), so a negative sign on t is irrelevant. The only difference between a black hole and a white hole is the behavior at the event horizon. Oh, and the Hawking radiation of a black hole is the emission of a white hole.

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