Re: Are *observed* SR effects real?

mluttgens@xxxxxxxxxx wrote:
Are *observed* SR effects real?

Luttgens:

Two persons, A and B, are both 1.60 m tall when their
height is mesured in the same room.
After some jogging, the distance between A and B is
x meters, and A will claim that B measure 0.80 m, whereas
B will observe that A measures 0.80 m. Of course, both
are right, but this doesn't change the intrinsic height of
A and B, i.e. 1.60 m.

Similarly, Kat considers that Dirk Vdm measured
only 2.5 years on his clock, aginst 5 years on her clock,
and Vdm claims that Kat travelled during 5 years, but
measured 5 * sqrt(1-0.866^2) =~ 2.5 years on her clock.

SRists don't realize that such observational differences
represent a mere perspective effect, but not an intrinsic
modification of clock rates. They claim that Kat's time has
been physically 'dilated' by a factor 2 because of her
motion wrt the Earth, even if other observers wrt
to which Kat would be moving at othir velocities would
find other 'dilation' factors.
They nevertheless believe that such 'time dilation' is
a permanent effect, which is of course stupid, as it is
simply an observational artefact.

Their belief that clock rates are physically and
*permanently* affected by motion is not different from
that of primitive people, who think that distances
physically affect the height of observed persons.
But those primitive people, unless they were very stupid,
don't believe that the perspective effect is permanent.

Restating your misconceptions doea not make them any more true.

Martin Hogbin
.

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