Einsteinians inform the gullible world that, even if the speed of light is variable, Divine Albert's Divine Theory remains alive and kicking:

Mitchell J. Feigenbaum: "In this paper, not only do I show that the constant speed of light is unnecessary for the construction of the theories of relativity, but overwhelmingly more, there is no room for it in the theory." http://arxiv.org/PS_cache/arxiv/pdf/0806/0806.1234v1.pdf

Mark Buchanan: "...a photon with mass would not necessarily always travel at the same speed. Feigenbaum's work shows how, contrary to many physicists' beliefs, this need not be a problem for relativity." http://www.newscientist.com/article/mg20026801.500-why-einstein-was-wrong-about-relativity.html

Jean-Marc Levy-Leblond: "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." http://o.castera.free.fr/pdf/One_more_derivation.pdf

Sabine Hossenfelder: "If photons had a restmass, special relativity would still be as valid as it's always been. The longer answer is that the invariance of the speed of light features prominently in the popular explanations of special relativity for historic reasons, not for technical reasons. Einstein was lead to special relativity contemplating what it would be like to travel with light, and then tried to find a way to accommodate an observer's motion with the invariance of the speed of light. But the derivation of special relativity is much more general than that, and it is unnecessary to postulate that the speed of light is invariant." http://backreaction.blogspot.bg/2016/05/dear-dr-b-if-photons-have-mass-would.html

Jean-Marc Lévy-Leblond: "Il se pourrait même que de futures mesures mettent en évidence une masse infime, mais non-nulle, du photon ; la lumière alors n'irait plus à la "vitesse de la lumière", ou, plus précisément, la vitesse de la lumière, désormais variable, ne s'identifierait plus à la vitesse limite invariante. Les procédures opérationnelles mises en jeu par le "second postulat" deviendraient caduques ipso facto. La théorie elle-même en serait-elle invalidée ? Heureusement, il n'en est rien..." http://o.castera.free.fr/pdf/Chronogeometrie.pdf

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Pentcho Valev

On Thursday, August 11, 2022 at 3:13:48 AM UTC-7, Pentcho Valev wrote:

[same thing since 1995]

Regarding the question in the subject line: it's neither.

--
Jan

JanPB wrote:
>
> On Thursday, August 11, 2022 at 3:13:48 AM UTC-7, Pentcho Valev wrote:
>
> [same thing since 1995]
>
> Regarding the question in the subject line: it's neither.
>
> --
> Jan

I would say it is...if you believe in flying saucers, paralell
universes, then...go ahead and continue believing that.

--
The Starmaker -- To question the unquestionable, ask the unaskable,
to think the unthinkable, mention the unmentionable, say the unsayable,
and challenge
the unchallengeable.

On 2022-08-11 14:55:39 +0000, JanPB said:

> On Thursday, August 11, 2022 at 3:13:48 AM UTC-7, Pentcho Valev wrote:
>
> [same thing since 1995]

I hadn't reaized it was so long ago. I thought he was mainly displaying
his ignorance of thermodynamics at that time.
>
> Regarding the question in the subject line: it's neither.

No, but Pentcho has had a lot of practice with dishonesty. I'm
surprised he has the chutzpah to raise the topic here.

--
Athel -- French and British, living mainly in England until 1987.

In the Einstein cult thesis and antithesis harmoniously coexist (doublethink). Theoretical physicists believe that the mass-energy equivalence formula E=mc² was gloriously derived by Einstein in 1905 and at the same time they admit that the formula has nothing to do with Einstein's relativity:

Brian Koberlein: "This led Henri Poincaré to propose non-electromagnetic stresses to hold the electron together. When he calculated the energy of these stresses, he found it amounted to a fourth of an electron's total mass. Thus, the "actual" mass of the electron due to its electric charge alone must be m=E/c². Poincaré's paper deriving this result was published in June of 1905, just a few months before Einstein's paper. Although the equation is often attributed to Einstein's 1905 paper, Einstein didn't actually derive the equation from his theory of relativity." https://www.forbes.com/sites/briankoberlein/2017/11/09/the-history-of-einsteins-most-famous-equation/

Hans C. Ohanian: "Although Einstein's name is closely linked with the celebrated relation E=mc² between mass and energy, a critical examination of the more than half dozen "proofs" of this relation that Einstein produced over a span of forty years reveals that all these proofs suffer from mistakes. Einstein introduced unjustified assumptions, committed fatal errors in logic, or adopted low-speed, restrictive approximations. He never succeeded in producing a valid general proof applicable to a realistic system with arbitrarily large internal speeds." https://arxiv.org/ftp/arxiv/papers/0805/0805.1400.pdf

Philip Ball: "The biggest revelation for me was not so much seeing that there were several well-founded precursors for the equivalence of mass and energy, but finding that this equivalence seems to have virtually nothing to do with special relativity. Tony Rothman said to me that "I've long maintained that the conventional history of science, as presented in the media, textbooks and by the stories scientists tell themselves is basically a collection of fairy tales." I'd concur with that." http://philipball.blogspot.com/2011/08/did-einstein-discover-emc2.html

George Orwell: "Doublethink means the power of holding two contradictory beliefs in one's mind simultaneously, and accepting both of them."

https://render.fineartamerica.com/images/images-profile-flow/400/images-medium-large/split-personality-computer-artwork-david-mack.jpg

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Pentcho Valev