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

Interesting quote from a book by Einstein

  1. Sep 13, 2003 #1

    marcus

    User Avatar
    Science Advisor
    Gold Member
    2015 Award
    Dearly Missed

    Something Einstein wrote in 1952 contains this quote

    "Space-time does not claim existence on its own, but only as a structural quality of the field."

    It is not especially easy to grasp the meaning, I suspect, but it might be worth thinking about. Eh quoted this in another PF thread and I was able to find an online reference in this Usenet post, which gives more context:

    > However, I consider the ultimate words of Einstein on this matter
    > to be the fifth appendix, added in 1952 (three years before his
    > death), to the fifteenth edition of his book "Relativity: The
    > Special and the General Theory." In that appendix, titled
    > "Relativity and the Problem of Space," Einstein explicitly
    > addresses the issue in question here. (Note that in the following
    > "type (1)" space is Minkowski space.)>
    > "If we imagine the gravitational field, i.e., the
    > functions g_ik, to be removed, there does not remain a
    > space of the type (I), but absolutely _nothing_, and
    > also no 'topological space'. For the functions g_ik
    > describe not only the field, but at the same time also
    > the topological and and metrical structural properties
    > of the manifold. A space of type (I), judged from the
    > standpoint of the general theory of relativity, is not
    > a space without field, but a special case of the g_ik
    > field, for which -- for the coordinate system used,
    > which in itself has no objective significance -- the
    > functions g_ik have values that do not depend on the
    > co-ordinates. There is no such thing as an empty space,
    > i.e., a space without field. Space-time does not claim
    > existence on its own, but only as a structural quality of the field"

    The Usenet post by Paul Stewart is archived at
    http://www.lns.cornell.edu/spr/2003-07/msg0052723.html
     
    Last edited: Sep 13, 2003
  2. jcsd
  3. Sep 13, 2003 #2
    Space-time has its existence on gik, your right something worth thinking about, why is this?
     
  4. Sep 13, 2003 #3

    marcus

    User Avatar
    Science Advisor
    Gold Member
    2015 Award
    Dearly Missed

    I have to go, before parking downtown gets too bad, but will be back.

    I wont be able to answer your question anyway

    I have found Rovelli's book (the philosophical parts) helpful

    http://www.cpt.univ-mrs.fr/~rovelli

    the link to the book "Quantum Gravity" he is writing is
    down at the bottom of the page

    I'm thinking of the example on page 40,41 of the two stars
    one is rotating and one is not
    with respect to what? are they rotating and not rotating.

    and his example of the expanding cloud of galaxies

    the bewilderment about space and time goes way back and
    he is both a physicist and a science-historian
    so he brings a certain amount of perspective to it

    but other people may have found other discussions of the same problems that they prefer

    i will get back to this later today
     
    Last edited: Sep 13, 2003
  5. Sep 13, 2003 #4

    jeff

    User Avatar
    Science Advisor

    This final development in einstein's view of the ontological status of spacetime was a direct result of his research on the "unified field theory": If the metric component fields gμν transform into and out of other substantial physical fields, as claimed by UFT, than a dualist view of physical reality in terms of an autonomous spacetime must give way to a purely relationalist view, even though absolute motions may still be defined which are not relative to absolute spacetime, but to the spacetime constituted by the totality of physical fields (rather than by some of them).
     
  6. Feb 29, 2004 #5
    The original book was written in a german language. Space-time is in my language "rymdtid". He want's to say:
    Time in space does not claim existence on its own,
    but only as a structural quality of the field or the net.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?



Similar Discussions: Interesting quote from a book by Einstein
  1. This is interesting. (Replies: 1)

Loading...