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The LightCone in the 3D

  1. Feb 5, 2006 #1
    The LightCone in the "3D"

    How does the light"cone" appear if we include the 3rd dimension of space into the picture?
  2. jcsd
  3. Feb 5, 2006 #2


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    As a sphere growing from a point at present in both forward and backward time. The "cone" with a 3-D cross section is now a 4-D object, and you can't embed it in 3-space. That's why we do the 2-D cross section in diagrams.
  4. Feb 5, 2006 #3


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    What do you mean by "appear"? You can't draw 4 dimensions in 3 dimensional space so you can't "see" it in that sense.
  5. Feb 14, 2006 #4
    Is it so?

    As we can project the an 3D image on a sheet of paper, can we project a 4D object to the 3D world, not atleast to a sheet of paper. I have heard that George Gamow gave some notes about that in his book 1,2,3 infinity
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