1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Time time time

  1. Oct 25, 2009 #1
    Time time time

    Can the laws of gravity permit curving space and time in such a way as to make time travel possible.
    Einstein's theory of relatively states that the space/time continuum can be flat, but it can also be curved by gravitational fields.

    Perhaps time has three folds
    1. the moment that existed
    2. the moment presently existing
    3. the moment about to exist

    We all know that time is used to compare the durations of events and the intervals between them, and to quantify the motions of objects.
    Time has been a major subject of religion, philosophy, and science, but defining it in a non-controversial manner applicable to all fields of study has consistently eluded the greatest scholars

    Now if time needs set of fundamental units from which every other unit can be generated how can this be expressed in a way that has non-controversial manner applicable to all fields in controlling the curvature of space and time.
  2. jcsd
  3. Oct 25, 2009 #2


    User Avatar
    Science Advisor
    Gold Member

    The short answer is NO. However, there are theoretical quantum constructs in which the future influences the past. These are the so-called time symmetric interpretations, for example Relational Blockworld:


    There are others too, such as Cramer's version. Generally, c is respected in these interpretations but it can be +c or -c.
  4. Oct 25, 2009 #3


    Staff: Mentor

    Whether or not something is controversial is irrelevant to its scientific rigor or correctness. I think that is a pretty useless criterion.
  5. Oct 25, 2009 #4
    In general, time travel is not believed to be currently feasible....but there may be some possibilities...Wikipedia has one discussion of interest.... http://en.wikipedia.org/wiki/Time_travel

    Wormholes have been the object of much speculation for such tyravel and utilized in the fictional movie CONTACT with Jodie Foster....not bad for its time....Roger Penrose discusses wormholes birefly in 30.6 of THE ROAD TO REALITY and concludes they'd pich off (collapse) before anyone/anything could get through....

    Travel into the "future" might be possible, but travel into the past is very unlikely. As Roger Penrose says////Time travel in the past seems to be ruled out by the empirical fact that we are not deluged with travelers from the future///although I am unsure if we were being observed that we would necessarily be aware of that fact.
  6. Oct 25, 2009 #5
    I'm going with you in this ..& if we have a phylosophical thinking ,we'll know that the travel to the past is out of the question..if it does .we won't be here ..the sky won't be the sky ..the water won't be the water .. briefly ,we may even have an antipode universe ..
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook