i'm time traveling right now.
Physics <<<<<Time Travel>>>>>, The Past, Present, and Future
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 Feb 8 2010, 10:58 AM
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3,592 posts Joined: Oct 2005 
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Nov 1 2010, 02:38 PM
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#2
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QUOTE(nice.rider @ Oct 31 2010, 11:00 PM) Going back from a state with higher entropy to a state with lesser entropy violates the 2nd law. No matters what you do, what machine you built, all your efforts introduce more entropy to the system. I think your knowledge of entropy is too simple and incomplete.A simple analogy is you find a plain surface and dig a hole, there is no way you could make it back to the original plain surface again, all your efforts ended up producing more disorder to the system. Good luck with your time travel journey. Hope you do it for good.  ask yourself these questions: 1. I make a ceramic cup from clay - does the entropy of the clay/cup increase or decrease? 2. I break the cup i made into pieces - does the entropy of the clay/cup increase or decrease? |
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Nov 2 2010, 01:55 AM
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#3
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QUOTE(SpikeMarlene @ Nov 1 2010, 11:51 PM) Therefore time travel is not possible. correct, hence the phrasing of the question from the perspective of the "cup". given that time travel ideas almost always involve extra dimensions. our 3/4 dimensions can be considered a "local system"?Added on November 2, 2010, 12:11 am Entropy always increases no matter what you do. The reason for entropy to "decrease" is because you are only looking at a local system. The entropy decreases from clay to a ceramic cup is less than the work (that is lost as a result) that requires to form it. Hence when you sum the total entropy of the total system, entropy increases. |
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Nov 3 2010, 12:54 AM
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#4
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QUOTE(SpikeMarlene @ Nov 2 2010, 12:38 PM) What is then hidden within our normal 4 dimensional space-time? What is outside our universe that interacts with it thermodynamically to decrease entropy? We may have a lot of ideas but these to me are just speculative. I am an old fashioned guy and have yet to see evidence for multi dimensional theories ... its a thought exercise that's nothing more than an idea. currently explored in super string, m-theory etc by various top minds such as michio and hawking.hawking and other top quantum physicist did suggest that there is nothing wrong with traveling opposite of the thermodynamic arrow. just that we cant do it  i hope you didnt get the idea that i meant time traveling is possible now. it's at about the same region at traveling at light speed, wormholes, hyperspace, etc. science fiction fodder (for now) |
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Nov 5 2010, 12:39 AM
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#5
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QUOTE(befitozi @ Nov 4 2010, 02:14 PM) Hmm, i never thought of it this way. Perhaps if we can create a machine to view a certain event, certainly much more feasible than a machine to take us physically there. This could find good use in forensics a concept explored in the movie "deja vu" (ignore the ending) |
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