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Article #1318

Re: Lorentz transformations from the 1st postulate

#1318
From: Pentcho Valev
Date: Mon, 16 Feb 2009 07:45
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On Feb 16, 2:15 am, YBM <ybm...@nooos.fr> wrote in
sci.physics.relativity:
> Dono a écrit :
> > Yes and no. You can't finish the derivation without the additional
> > information (like the second postulate). So, you CANNT derive the
> > Lorentz transforms from the first postulate only the way the OP
> > climed. This is the main disagreement between me andTom.
>
> Imagine that one day physicists discover that a photon as a non zero
> mass, surely a very small one. Does this kill the importance of
> Lorentz invariance? No, c would not match anymore the speed of light,
> that's all.

Jean-Marc Lévy-Leblond a détruit la rationalité des Einsteiniens en
France pour toujours:

http://o.castera.free.fr/pdf/chronogeometrie.pdf
Jean-Marc Levy-Leblond "De la relativite à la chronogeometrie ou: Pour
en finir avec le "second postulat" et autres fossiles": "D'autre part,
nous savons aujourd'hui que l'invariance de la vitesse de la lumiere
est une consequence de la nullite de la masse du photon. Mais,
empiriquement, cette masse, aussi faible soit son actuelle borne
superieure experimentale, ne peut et ne pourra jamais etre consideree
avec certitude comme rigoureusement nulle. Il se pourrait meme que de
futures mesures mettent en evidence une masse infime, mais non-nulle,
du photon ; la lumiere alors n'irait plus à la "vitesse de la
lumiere", ou, plus precisement, la vitesse de la lumiere, desormais
variable, ne s'identifierait plus à la vitesse limite invariante. Les
procedures operationnelles mises en jeu par le "second postulat"
deviendraient caduques ipso facto. La theorie elle-meme en serait-elle
invalidee ? Heureusement, il n'en est rien ; mais, pour s'en assurer,
il convient de la refonder sur des bases plus solides, et d'ailleurs
plus economiques. En verite, le "premier postulat" suffit, a la
condition de l'exploiter a fond."

http://o.castera.free.fr/pdf/onemorederivation.pdf
Jean-Marc Levy-Leblond: "This is the point of view from wich I intend
to criticize the overemphasized role of the speed of light in the
foundations of the special relativity, and to propose an approach to
these foundations that dispenses with the hypothesis of the invariance
of c....We believe that special relativity at the present time stands
as a universal theory discribing the structure of a common space-time
arena in which all fundamental processes take place....The evidence of
the nonzero mass of the photon would not, as such, shake in any way
the validity of the special relativity. It would, however, nullify all
its derivations which are based on the invariance of the photon
velocity."

Pentcho Valev
pvalev@yahoo.com
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From: Pentcho Valev <pvalev@yahoo.com>
Newsgroups: sci.physics.relativity,sci.physics,fr.sci.physique,fr.sci.astrophysique,fr.sci.maths
Subject: Re: Lorentz transformations from the 1st postulate
Date: Sun, 15 Feb 2009 23:45:06 -0800 (PST)
Organization: http://groups.google.com
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