Results 1 to 6 of 6

Thread: Term for relativistic contraction of accelerating object?

  1. #1
    Join Date
    Jan 2005
    Location
    New Zealand
    Posts
    11,172

    Term for relativistic contraction of accelerating object?

    I know most people reading this will say "that's Bell's spaceship paradox" - but it's something else I've seen named - but have forgotten again.

    (((I think it's another relativity of simultaneity thing: if you accelerate an object, it's by definition moving according to someone, and they may not be able to agree with someone else that the front and back of the object accelerated by the same amount at the same time.)))

    Last time I saw the name for this effect mentioned, I made a link somewhere - that I now can't find.

    Apologies that I can't be more precise or detailed.
    Measure once, cut twice. Practice makes perfect.

  2. #2
    Join Date
    Feb 2003
    Location
    Depew, NY
    Posts
    12,732
    Longitudinal contraction?

    (edit, I am not sure that's a "thing". As near as a I can tell most people say "length contraction" and longitudinal pops up when it's important to say how said item is contracted along the line of travel.)
    Last edited by Solfe; 2021-Jul-06 at 05:37 AM.
    Solfe

  3. #3
    Join Date
    Apr 2011
    Location
    Norfolk UK and some of me is in Northern France
    Posts
    10,114
    It remains length contraction relative to an observer but the maths, especially the general cases of three and four accelerations get more complex. You basically differentiate the Lorenz contraction. The contraction seen by an observer is basically because of finite speed of light and velocities near that speed. I believe in Einstein SR it , acceleration, is not covered and was developed by others.
    sicut vis videre esto
    When we realize that patterns don't exist in the universe, they are a template that we hold to the universe to make sense of it, it all makes a lot more sense.
    Originally Posted by Ken G

  4. #4
    Join Date
    Apr 2007
    Location
    Nowhere (middle)
    Posts
    39,923
    https://en.wikipedia.org/wiki/Length_contraction

    Length contraction is the phenomenon that a moving object's length is measured to be shorter than its proper length, which is the length as measured in the object's own rest frame.[1] It is also known as Lorentz contraction or Lorentz–FitzGerald contraction (after Hendrik Lorentz and George Francis FitzGerald) and is usually only noticeable at a substantial fraction of the speed of light.
    "I'm planning to live forever. So far, that's working perfectly." Steven Wright

  5. #5
    Join Date
    Jul 2005
    Posts
    21,207
    The differential acceleration experienced by the inhabitants of a coordinate system that is uniformly accelerating for an inertial observer (the foundation of Bell's Paradox), is described by the Rindler metric, which is often mentioned in discussions of this phenomenon. The experience of observers who are being continuously accelerated by a rotating reference, (Langevin observers) is described by the Born metric.

    Grant Hutchison
    Science Denier and Government Sponsored Propagandist. Here to help.
    Blog

  6. #6
    Join Date
    Jan 2005
    Location
    New Zealand
    Posts
    11,172
    Thanks for all the above everyone, all good and accurate information.
    Measure once, cut twice. Practice makes perfect.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •