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Range of time

  1. Jul 26, 2011 #1
    Question: have some sense that in a space time with metric [tex]ds^2 = g_{tt}dt^2+ g_{xx}dx^2+ g_{yy}dy^2+g_{zz}dz^2[/tex], the coordinates [tex] x,y,z \in ]-\infty, \infty[ [/tex] , but [tex] t \in [0, \infty[ [/tex] ??????
  2. jcsd
  3. Jul 26, 2011 #2


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    In flat spacetime (Minkowski space), t ranges over the whole real line. In other spacetimes, there can be all kinds of different cases. In general, you can't even cover a whole manifold with a single coordinate chart.
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