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Thread: Arrow's of time

  1. #1 Arrow's of time 
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    Apparently there are three arrow's of time .

    1)physiological time- It is the direction of time by which we feel that we are going on .It is the time by which we remember only the past but not the future.

    2)thermodynamic time-It is the direction of time which increases with increase in entropy.

    3)cosmological time- It is the direction of time in which universe expand's.

    The thermodynamic time and the cosmological time both point in the same direction,but why not physiological time.Physiological time has 2 direction one is the past and another one is the future.


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  3. #2  
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    Quote Originally Posted by krishnabharadwajr View Post
    Physiological time has 2 direction one is the past and another one is the future.
    No it doesn't:
    1)physiological time- It is the direction of time by which we feel that we are going on.


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  4. #3  
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    Why can we only remember past and why not the future. Will it be possible if entropy decreases.
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    Malignant Pimple shlunka's Avatar
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    Because the information present in the future isn't observable from the perspective of human sensory perception.
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  6. #5  
    Genius Duck Dywyddyr's Avatar
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    We remember the past because it's already happened.
    If we could "remember" the future it would mean that it's fixed, not variable.
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  7. #6  
    Anti-Crank AlexG's Avatar
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    Time flies like an arrow, fruit flies like a banana.
    Its the way nature is!
    If you dont like it, go somewhere else....
    To another universe, where the rules are simpler
    Philosophically more pleasing, more psychologically easy
    Prof Richard Feynman (1979) .....

    Das ist nicht nur nicht richtig, es ist nicht einmal falsch!"
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  8. #7  
    Forum Professor astromark's Avatar
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    Quote Originally Posted by krishnabharadwajr View Post
    Apparently there are three arrow's of time .

    1)physiological time- It is the direction of time by which we feel that we are going on .It is the time by which we remember only the past but not the future.

    2)thermodynamic time-It is the direction of time which increases with increase in entropy.

    3)cosmological time- It is the direction of time in which universe expand's.

    The thermodynamic time and the cosmological time both point in the same direction,but why not physiological time.Physiological time has 2 direction one is the past and another one is the future.
    Physiological time is buncum.. You perception does not change time. Just your perception of it.

    and then attaching the rate of time to the entropy rate is not supported by any science.

    I would argue a case that time unfolds regardless of the state and rate of matter in space..

    The actual sequence and rate of time does not give a nanosecond as to your perception of it.
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  9. #8  
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    If a system were to reach the highest possible state of entropy, there would be no arrow of time at all.

    Maybe having an arrow of time is what decreases when entropy increases.

    Maybe multiple systems of causality are possible, but only one has been observed on Earth because Earth is presently moving in one of the possible causal directions? We of course evolved here, so our minds might be designed to observe that direction exclusively.

    Just thinking, because time and entropy are basically the same thing. All non-entropy related events are reversible in time. Or rather, events that don't involve entropy look the same whether you look at them forward in time or backward in time.
    Some clocks are only right twice a day, but they are still right when they are right.
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  10. #9  
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    and is entropy zero inside a black hole ............. If we think of physiological time pointing backwards, we get to a situation where broken cups gather around. Now as black hole is similar example of entropy decrease ,can it be said that time runs backward's there.
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  11. #10  
    Anti-Crank AlexG's Avatar
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    If we think of physiological time pointing backwards
    Physiological time doesn't exist.

    Now as black hole is similar example of entropy decrease ,can it be said that time runs backward's there.
    No. Time does not run backwards because of decreasing entropy. There are many systems where entropy decreases locally, without time reversing.
    And in fact, Black Holes have the maximum entropy possible.
    Its the way nature is!
    If you dont like it, go somewhere else....
    To another universe, where the rules are simpler
    Philosophically more pleasing, more psychologically easy
    Prof Richard Feynman (1979) .....

    Das ist nicht nur nicht richtig, es ist nicht einmal falsch!"
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  12. #11  
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    Quote Originally Posted by AlexG View Post
    If we think of physiological time pointing backwards
    Physiological time doesn't exist.

    Now as black hole is similar example of entropy decrease ,can it be said that time runs backward's there.
    No. Time does not run backwards because of decreasing entropy. There are many systems where entropy decreases locally, without time reversing.
    And in fact, Black Holes have the maximum entropy possible.
    What is the difference between space time and time.
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  13. #12  
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    Quote Originally Posted by krishnabharadwajr View Post
    and is entropy zero inside a black hole ............. If we think of physiological time pointing backwards, we get to a situation where broken cups gather around. Now as black hole is similar example of entropy decrease ,can it be said that time runs backward's there.
    At the extreme of entropy, time just plain doesn't exist. However, .... if you became part of a system like that, you would achieve the extreme of entropy as well, and that would mean you had been completely disintegrated. Not just dead. Totally destroyed. Deprived of any and all resemblance to a human being.

    Now whether your destroyed remnants would end up in the past or the future - I don't know. It also doesn't matter.

    To be more precise: since there is no way to distinguish your destroyed remnants from any other part of the system, there is no way to tell where in the system your parts ended up. There's no way to observe whether they ended up in the system's past or the system's future.

    I guess that, since the total mass of the system would have increased slightly - probably we'd still have to say your parts ended up in the future. But it's all philosophical at this point.

    Since you were utterly eliminated, it's probably most accurate to say you didn't end up anywhere.
    Some clocks are only right twice a day, but they are still right when they are right.
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  14. #13  
    Forum Freshman overthelight's Avatar
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    I'm thinking how to make the time more to play online games.
    Science gives people the hope always.
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    Quote Originally Posted by overthelight View Post
    I'm thinking how to make the time more to play online games.
    ~~ I think this is a noble quest... To facilitate this action is a little more complex.. You might actually be able to do this..

    but a massive resource base would be required.. Lots of $$$.

    Build a vehicle that could accelerate you away from Earth at a rate of 1g acceleration force.

    Travel for a period of time that fits your needs.. but unfortunately NO online game could be played.

    As your craft nears light velocity time passage will slow for you.. This would only be apparent when you return.

    You might have been away for just a few years according to you. On your return, everyone you knew has gotten decades older..

    and 'they' will not want to play anymore.... Sorry, cancel the whole idea..

    ~~ A better idea might be to seek more fulfilling pastimes and the want to stretch time shrinks...
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