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Thread: Time Reversal?

  1. #1 Time Reversal? 
    Forum Radioactive Isotope zinjanthropos's Avatar
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    This just popped up. No other information.

    https://www.ctvnews.ca/sci-tech/scie...uter-1.4334427


    All that belongs to human understanding, in this deep ignorance and obscurity, is to be skeptical, or at least cautious; and not to admit of any hypothesis, whatsoever; much less, of any which is supported by no appearance of probability...Hume
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  3. #2  
    Genius Duck Moderator Dywyddyr's Avatar
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    https://www.nature.com/articles/s41598-019-40765-6


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  4. #3  
    exchemist
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    As I read it, this is merely a theoretical simulation of a process in which the "thermodynamic arrow of time", i.e. the tendency for entropy to increase, can be reversed very briefly, in special circumstances.

    This does not seem to me to suggest that time really goes backwards, merely that the operation of the 2nd Law of TD can sometimes be briefly interrupted.
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  5. #4  
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    Quote Originally Posted by exchemist View Post
    As I read it, this is merely a theoretical simulation of a process in which the "thermodynamic arrow of time", i.e. the tendency for entropy to increase, can be reversed very briefly, in special circumstances.

    This does not seem to me to suggest that time really goes backwards, merely that the operation of the 2nd Law of TD can sometimes be briefly interrupted.
    How complex is the system they are talking about?

    Can its complexity be given a numerical value in this situation?
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  6. #5  
    Forum Radioactive Isotope zinjanthropos's Avatar
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    All that belongs to human understanding, in this deep ignorance and obscurity, is to be skeptical, or at least cautious; and not to admit of any hypothesis, whatsoever; much less, of any which is supported by no appearance of probability...Hume
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  7. #6  
    exchemist
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    Quote Originally Posted by zinjanthropos View Post
    Yup, that's a lot more like it.

    And actually they have not even simulated a short-term violation of the 2nd Law of TD, by this account.
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