Science Forum

Science Forum

  1. Subscribersonhouse
    Fast and Curious
    slatington, pa, usa
    Joined
    28 Dec '04
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    52855
    05 Apr '19 00:38
    https://phys.org/news/2019-04-researchers-develop-way-to-control.html

    It says they made the light go 30X faster, WTF? Is that just another phase velocity thing?
  2. Standard memberHandyAndy
    Non sum qualis eram
    At the edge
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    05 Apr '19 03:36
    @sonhouse said
    https://phys.org/news/2019-04-researchers-develop-way-to-control.html

    It says they made the light go 30X faster, WTF? Is that just another phase velocity thing?
    Wut?
  3. Joined
    06 Mar '12
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    625
    05 Apr '19 06:52
    Your OP link says;

    "...Abouraddy and study co-author Esat Kondakci demonstrated they could speed a pulse of light up to 30 times the speed of light..."

    which sounds like nonsense because that's impossible. If they DID do such a thing it would be huge news and on every front page. But perhaps they were misquoted? Or perhaps that was a missedit? Or perhaps what they exactly meant isn't as indicated by their exact words there?
  4. Standard memberDeepThought
    Losing the Thread
    Cosmopolis
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    05 Apr '19 16:01
    @humy

    The original paper is downloadable for free from Nature's website, the link is in the phys.org article. They are talking about group velocity and specify, in the abstract that this is not in contradiction with relativity as information cannot be transferred this way. This is in free space using carefully shaped wave packets.

    I need to do a little revision before commenting further as I was under the impression that group velocity did specify the speed of propagation of energy and information.
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