space&time are connected, could the big bounce make time go backwards as the universe collapsed in on itself just for it to then start again?

As in could time travel backwards as the universe collapses then forwards again after another Big Bang? Things could play out exactly as they have just happened over and over again? 

4 Answers

  • neb
    Lv 7
    1 month ago
    Favorite Answer

    No, a collapsing universe does not reverse time. Various cosmological metrics have time flowing in one direction regardless of whether the universe is expanding or contracting. There is a scale factor for the space components of the metric. It is normalized to 1 corresponding to our current time. If the scale factor is greater than 1 the universe is expanding, if less than 1 it is contracting. In both cases the time component of the metric is unscaled and unaffected by the scaling of the space components.

  • 1 month ago

    Many philosophers believe this. I tend to believe it too. It really isn't a question of science because there is no way to prove or disprove it. 

    Why does time flow at all? What makes NOW a special moment? Science can't explain it. 

  • 1 month ago

    Anything "could" happen, especially if you lower your threshhold for what you consider has the remotest chance over ever being credibly possible.

    As to whether it has any valid likelihood in reality is another matter.

    All evidence suggest the expansion of the universe is accelerating, and the future points to a "big rip".

  • 1 month ago

    No. Time cannot go backwards because time and entropy go in only one direction in time. 

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