Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

B Regression of Universe

  1. Sep 18, 2016 #1
    If every particle of the Universe was made to occupy the state at which it was 2 years ago, would there be an action replay of events from (T-2) yrs to T ? Or would subsequent events be different ?:rolleyes:
     
  2. jcsd
  3. Sep 18, 2016 #2

    Simon Bridge

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member
    2016 Award

    Short answer: nobody knows.
    This is part of the problem of determinism - and there is currently no solution.
    The usual consensus is along the lines that the Universe will not play out exactly the same way twice from the same initial conditions ... this is because of some very sensitive statistical/quantum mechanics effects at the fundamental particle level. But it will be broadly similar.
    However, this is an opinion based on an assumption that the underlying physics of the Universe is statistical in nature.
    That may not be true: there may be an underlying structure that makes everything deterministic again.
     
  4. Sep 18, 2016 #3

    mfb

    User Avatar
    2016 Award

    Staff: Mentor

    How can you define "now" without reference to the state of the universe and the particles in it?

    This is a purely philosophical question, physics cannot answer philosophical questions and we are not a philosophy forum.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Regression of Universe
  1. The Universe (Replies: 1)

  2. Sound wave regression (Replies: 3)

Loading...