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A Speed of Gravitational Waves confirmed by Experiment?

  1. Jul 28, 2017 #1
  2. jcsd
  3. Jul 28, 2017 #2
    Hi and welcome to PF!
    If you read to the bottom of your link, the last section states "The speed of gravitational waves (vg) is predicted by general relativity to be the speed of light (c)."
    This is obvious in the delay between the sites separated by 3002km.
     
  4. Aug 2, 2017 #3

    mfb

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    The observation only sets an upper limit on the speed. Different directions lead to different speeds, with the fastest one corresponding to a wave propagation aligned with the line between the two observatories. The expectation is the speed of light, of course.
     
  5. Aug 23, 2017 #4
    Once more observatories are built, it will be possible to accurately determine the direction and speed.
     
  6. Aug 23, 2017 #5

    mfb

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    Three observatories, as we have it now (2*LIGO and VIRGO), give a 2-D location in the sky, with a fourth one we will get a direct speed measurement. Seeing an event in the electromagnetic spectrum could give a much more accurate speed measurement.
    I don't think there are serious doubts that it is the speed of light.
     
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