Relativity Principle Revisited

On 25 , 17:18, Tom Roberts wrote in
sci.physics.relativity:
Koobee Wublee wrote:
On Aug 24, 10:30 pm, Peter Christensen
wrote:
One of the really 'strange' things in nature is that light always
arrive to you with the speed c, no matter the velocity of the source
that is emitting it. That's why we need SR.

Yes, this is the case if you still are betting on the classical
theories.

My advice is: don't "bet" on theories, instead put your trust in the
EXPERIMENTS. If you do so, you'll find that to explain them ALL you need
SR or a theory equivalent to it (for those experiments within the domain
of SR).

Tom Roberts

Roberts Roberts one should always analyse the theory first, especially
when one deals with Einstein's relativity constantly manipulated by
criminals so as to predict anything. For instance, Pound and Rebka's
gravitational redshift factor 1+V/c^2 is a correct EXPERIMENTAL
result, but does it follow from Einstein's light postulate

http://www.fourmilab.ch/etexts/einstein/specrel/www/ "...light is
always propagated in empty space with a definite velocity c which is
independent of the state of motion of the emitting body."

and its equivalent statement according to which the speed of photons
is constant in a gravitational field? Perhaps it follows from the
emission theory equation c'=c+v valid in the absence of a
gravitational field and its equivalent equation c'=c(1+V/c^2) valid in
the presence of a gravitational field, where c is the initial speed of
photons relative to the light source, v is thew relative speed of the
light source and the observer and V is the gravitational potential
difference between the point of emission and the point of measurement?

Roberts Roberts if one is careless and does not analyse the theory,
criminals may confuse everything and make any experimental
verification useless, as in the following case:

http://groups.google.ca/group/sci.ph...34dc146100e32c
Tom Roberts: "If it is ultimately discovered that the photon has a
nonzero mass (i.e. light in vacuum does not travel at the invariant
speed of the Lorentz transform), SR would be unaffected but both
Maxwell's equations and QED would be refuted (or rather, their domains
of applicability would be reduced)."

Pentcho Valev