Decreasing entropy of the universe

AI Thread Summary
The discussion centers on the concept of entropy in the universe and the potential for its decrease if the universe is part of a larger system. It explores the implications of the Steinhardt-Turok cyclic model, suggesting that if our universe exists as a 3-brane within a 5-brane, energy could potentially be transferred from other universes. The idea hinges on the possibility of particles, possibly dark matter, moving between branes and carrying energy. However, the conversation acknowledges the speculative nature of these ideas, emphasizing the lack of evidence supporting them and the current scientific consensus that the universe is a closed system. Overall, the discussion raises intriguing questions about the relationship between entropy and the structure of the universe.
cansay27
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I'm not sure whether this belongs in this topic or Beyond the Standard Model.

I was reading through various articles and threads on this site when I had an epiphany, and now I am curious to see if it could work.

The biggest influence on the fate of the universe is its entropy. Because there is no way to decrease the entropy of a closed system, it must keep increasing until the universe runs out of available energy. My question is this: Could our universe's entropy decrease if it was a part of a much larger system, allowing heat death to be avoided?
Reading the Steinhardt-Turok cyclic model of the universe, I learned that our universe might be a 3-brane floating in a 5-brane, and that other universes could easily coexist just a few Planck lengths away. If there was some particle (dark matter perhaps) that could travel from one brane to the next, is it possible for that particle to carry energy into our brane?

Please forgive me if I am overlooking any details. I am a high school student who is interested in physics, but don't have enough knowledge to figure these things out for myself.
 
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IF the universe is NOT a closed system, then the laws of thermodynamics would agree with the possibility of deacreasing the entropy of the universe. However, this is highly speculative, so don't assume this to be true or try to push it to be true or anything like that. We have zero evidence for this. CURRENTLY, science believes that the universe is a closed system. It doesn't usually help anything to talk about possibilities without some kind of evidence.
 
Well plenty of work has been done on M-theory and we have no direct evidence of this, either. According to known knowledge on M-theory, does this work? I guess this is a better question.
 
cansay27 said:
Well plenty of work has been done on M-theory and we have no direct evidence of this, either. According to known knowledge on M-theory, does this work? I guess this is a better question.

I don't see why not.
 

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