Re: Cosmic speed limit and special relativity


N:dlzc D:aol T:com (dlzc) skrev:

Dear Komlan:

"Komlan" <komlan@xxxxxxxxx> wrote in message
news:1154646173.335784.327640@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
I'm new to this group, so I hope my questions don't
seem too trivial.

I've head many times that the speed of light (in the
vacuum) is constant with respect any observer
regardless of the speed of the emitting source and
the speed of the observer. Is this true?

The missing parts of what you have "heard", is that all observers
are inertial, and there are no masses of consequence nearby any
observer. This "constant speed of light" is a consequence of
Maxwell's equations, and a postulate of special relativity.

I also read many times that the speed of light is
like a cosmic speed limit, and that no moving body
(not even light) can ever exceed the speed of light
(c).

Correct. We have dumped massive amounts of energy into
individual electrons (a simple massive particle that is easy to
accelerate), yet can only get it moving "very very" close to c.

However, in Einstein's 1905 paper, you see speeds
such as (v + c) in the discussion "on relativity of
time and length". The experiment considered a
moving rod (speed v) with two ends A and B.
There is an observer and a clock at each end. The
observer at A emits a light, which bounces at B
and returns to A. The value c-v is used to
compute the time it takes the light to go from A
to B and the speed v+c to compute the time it
takes the light to return from B to A.

No ability exists in this Universe to measure the "one way speed
of light" (OWLS).

So my idea below will not work, would you be kind to tell me why?
I do not show any synch scheme for pod clocks since Tom Roberts told me
roundtrips are symmetric and isotropic within SR.(I hope that is true).
Otherwise i have a nice scheme for actually detect and synchronise
objects within (a fictional) aether.

Let us measure space events using rigorous clocks and rulers
constructed like this.

Place two sensorpods at (A and B) at x,y,z cordinates in space,
let (A) be master clock and initiate communication. Let them
synchronise by sending radiosignals of time to eachother in
communication fashion try to not introduce latency within the
electronic that receive and (answer,send) signals.
When signal from pod (A) sent and an answer is received from pod (B)
after two seconds passed at pod (A) we do know the pods separated by
300 000 km.


If signal (intervals,communication) remain constant we know that they
are at rest towards eachother.


Let clock (A) be master (B) slave just add one second to the received
signal of (B) and we know they are perfectly synchronized within the
defined rest space.


Now we have defined a rest space with a vector between (A and B) where
we can conduct experiments using our ship (C).


This would be a valid experiment setup within my mind, possible or not
i do not know.
But if possible then we would truly know what happens to clocks and
rulers in ship (C).


Let ship (C) fly by sensorpods (A and B) along their vector and
sending infinitsmall time signals we can actually measure the *exact*
moment
they pass by using the doppler shifts by reading the intervals we
receive signals from C).


Let the infinit small clockintervalls sent from (C) be timedsignals
that
(A and B) sensorpods are able to register.


The day we can let (C) fly within signifikant fractions of "c" we will
know the reality base of the framedependent clocks and rulers as
introduced by SR and Lorentz.


I rest assured that ship (C) clock stay synchronised with (A and B's)
synchronised clocks.
There will be no (latency,dilation) introduced within the clock of when

flying by A->B
It will stay synchronised it the way that (C)t2-(C)t1=(B)t1-(A)t1.


As long the ship not accelerated while pass (A and B) pod the ship
clock will always stay perfect synched with without introduction of
(latency,dilation).


This will be easy to prove by the readings performed by the pods, a
list of registered
timings in each pod show comparisson of (clocks,timings) in the fashion

(C)t:(A)t and (C)t:(B)t that will be doppler shifted, by looking at
doppler shift we can pick the exact (reading,moment) when ship fly by
each pod.


Then we perform our calculation (C)t2-(C)t1=(B)t1-(A)t1


I am confident the (numbers of timeintervals, time, ticks ) passed for
both ship and pods will be the same.


Of course we can go on doing more complex experiment including multiple



ships lasers and whatever but it is really not necessary.


And then we will know there is no time dilation, no length contraction
and really no frame
dependant distances.
*and we can pass the artefacts of SR and Lorentz (math,transformations)



*out of our knowledge system once and for all


JT





Doesn't seem to go against the notion of constancy
of the speed of light with respect to any observer
and the notion of cosmic speed limit?

It does not go against the constancy of c.

Can anyone tell me what I'm getting wrong here?

I hope between dda1's response and the above, you have some
answers that make sense to you.

David A. Smith

.

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