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A tensor equation that is valid in any coordinate system is valid in every coordinate system.

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05-18-2019 10:12 AM
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  1. x0x
    x0x liked post by KJW On thread : The God's eye global gist of general relativity
    You say this as an attempt to justify not doing any mathematics, don't you? But mathematics is the language of physics. Physical reality is far too complicated to be described by any language other...
    Liked On: 07-21-2014, 05:46 AM
  2. x0x
    x0x liked post by KJW On thread : The Varying Speed of Light
    I would say that there is no speed other than that measured locally, and that "The time delay is caused by the slowing of light as it moves through a change in gravitational potential." from the...
    Liked On: 07-19-2014, 01:15 PM
  3. lpetrich
    lpetrich liked post by KJW On thread : The original "frozen star" black hole interpretation is correct after all
    You've said this on more than one occasion. You think that it is self-evident and that no one will challenge it. But I'm going to challenge it: Prove that the two light pulses are not going at the...
    Liked On: 07-13-2014, 09:54 PM
  4. pikpobedy
    pikpobedy liked post by KJW On thread : The speed of sound in an enclosed compartment.
    No, inside the enclosed compartment, the observer is not moving relative to the air, which is moving with the train. The motion of train relative to the tracks is irrelevant, only the motion of the...
    Liked On: 07-12-2014, 04:04 AM
  5. Markus Hanke
    Markus Hanke liked post by KJW On thread : The original "frozen star" black hole interpretation is correct after all
    There is one other point which I have found difficult to express: The notion of a rate of time or a rate of clock that can change is really quite meaningless without some reference to compare to....
    Liked On: 07-11-2014, 11:38 AM
  6. GerryB
    GerryB liked post by KJW On thread : The speed of sound in an enclosed compartment.
    The speed of sound relative to the air at rest is constant, so for air in relative motion, the velocity of that motion will add to the velocity of the sound in the air at rest.
    Liked On: 07-09-2014, 11:09 PM
  7. Jilan
    Jilan liked post by KJW On thread : The God's eye global gist of general relativity
    Who said anything about flat meaning horizontal? What does "change in speed or direction" actually mean? For example, consider an observer at rest on the ground and another observer in...
    Liked On: 07-03-2014, 06:02 PM
  8. Markus Hanke
    Markus Hanke liked post by KJW On thread : The original "frozen star" black hole interpretation is correct after all
    The local speed of light is the same everywhere, including the event horizon. I strongly recommend that you examine the metric of the Schwarzschild blackhole so that you can avoid making mistakes...
    Liked On: 07-01-2014, 07:57 AM
  9. Jilan
    Jilan liked post by KJW On thread : Hawking Claimed Black Holes Exist, Right?
    MODERATOR NOTE: Without speaking on behalf of the other moderators, it is my view that any person who can generate interesting discussion on the forum, whether they be crackpot, troll, or whatever,...
    Liked On: 06-29-2014, 08:53 AM
  10. x0x
    x0x liked post by KJW On thread : The God's eye global gist of general relativity
    You asked me to explain why an object (an electron) falls down in gravity and that is what I explained. The distinction between an accelerated frame of reference and true gravitation due to spacetime...
    Liked On: 06-27-2014, 01:47 PM
  11. redhalls
    redhalls liked post by KJW On thread : Question about simulation world...
    It doesn't require you to observe him or for him to be constantly observed. It is sufficient that someone observed him at some time in history.
    Liked On: 06-27-2014, 07:36 AM
  12. Markus Hanke
    Markus Hanke liked post by KJW On thread : The Varying Speed of Light
    The motion is not relevant. The light wave could be a standing wave in a cavity and one could still establish the duration of 9192631770 periods. In other words, just because the light waves are in...
    Liked On: 06-19-2014, 04:13 PM
  13. Markus Hanke
    Markus Hanke liked post by KJW On thread : The Varying Speed of Light
    It is. You've chosen a criterion (the clocks would stay in sync) to satisfy your conclusion (different speeds of light). Since 1967, the second has been defined to be: the duration of...
    Liked On: 06-09-2014, 07:22 AM
  14. Jilan
    Jilan liked post by KJW On thread : 1/h as a coupling constant
    Maybe information is the only thing that does have a fundamental existence.
    Liked On: 05-23-2014, 04:51 PM
  15. Jilan
    Jilan liked post by KJW On thread : Turning light into matter
    It is a false impression because the part of the quote you omitted was the part of the quote that indicated how QED models electron-positron pair production as a higher-order process. The part of the...
    Liked On: 05-22-2014, 07:02 PM
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