Re: Train gedanken pitfall

On Jun 17, 7:22 pm, "Whoever" <no...@xxxxxxxxxxx> wrote:
"Bruce Richmond" <bsr3...@xxxxxxxxxxx> wrote in message

news:64bb2c20-7821-400f-9418-fb1878a42b21@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

Go ahead and measure the one way speed using synchronized clocks.  If
you get an answer other than c you better check that the clocks are
properly synchronized acording to SR or your experiment says nothing
about the validity of SR.

That's if you follow the method and accept Einstein's definition of
synchronization.  The method only synchronizes clocks if it is true that the
one-way speed of light IS the same in all directions.  If it isn't, then the
clocks will actually be out-of-sync and give a false result.  You need a
definition and method of synchronization that is independent of the one-way
speed of light in order to measure it.

You start off with an A time and a B time that are independent of each
other. Each keeps track of the sequence of events happening at that
location, but there is no way to relate when things happen at B
relative to those at A without first agreeing on when "now" is. That
is what relative simultaneity is all about. By agreement A and B use
light signals to sync their clocks. Part of that agreement is that
the light signals travel at the same speed in both directions. Since
there is no absolute time there is no way to prove these agreements
faulty, so long as all signals travel at the same maximum speed.
Someone can choose to sync the clocks differently and get different
results, but that does not make those results any more correct.

 There's no point in doing an
experiment to show a consistent one-way speed of light if that experiment
assumes its own conclusion.  All it CAN do is calculate what the one-way
speed WOULD be if it is indeed the same in all directions.

It IS the same because we MADE it the same.

Fortunately we don't NEED to show the one-way speed of light is the same in
all directions in order to test SR.  SR can make man predictions and so far
they are all supported (ie, not disproved) by experimental evidence.

.

Relevant Pages

  • Re: ABSOLUTE TRUTH ABOUT ABSOLUTE SPACETIME
    ... your synchronization scheme would lead to ... I'm just pointing out the important fact that if all inertial frames define ... mass, momentum, energy, electrodynamics, etc. E-synching clocks allows the ... > I interpret the PofR as a law of physics. ...
    (sci.physics.relativity)
  • Re: Einsteins Train Gedanken Re-visited
    ... let's help Androcles sort out his scruffy ... There Einstein first raises the question, if clocks are synchronized ... he uses that postulate to define synchronization with light rays as ... rod now moving at v along with two moving observers at points A and B. ...
    (sci.physics.relativity)
  • Re: A funny kind of rectilinearity
    ... > frame, but its direction in any frame clearly depends on the orientation ... toward an empty section of space where the detector will be in future, ... when S' believes that a pair of clocks have been properly ... special case) the clock synchronization procedure. ...
    (sci.physics.relativity)
  • Re: Are SR effects real or not? Simplified case.
    ... to that coordinate system is well-defined. ... and is more convenient to use for General Relativity. ... Einstein's synchronization procedure.) ... synchronize clocks. ...
    (sci.physics.relativity)
  • Re: What happened between Newton and Einstein?
    ... Please describe how this "measurement" can be made. ... postulate that says anything about clock synchronization. ... I can synchronize clocks without using light. ... Einstein cannot really synchronize ...
    (sci.physics.relativity)
Loading