Commenter Pentcho Valev, who appears not to have a blog of his own, although perhaps he should - on the other hand, it appears he has more important things to contemplate [oh, really? - ed] – has left a dash of depth, to test our synapses and metaphysical thoughts, on an earlier post about Dark Matter.
No, no – you don’t have to click on the link, unless you want to, I’m posting his magnificent input in full, for your enjoyment and personal illumination:
THE STRANGEST DILEMMA IN PHYSICS
Cosmological concepts like dark energy etc. are all based on frequency shift data and therefore the equations
c = Lf ; c' = L'f'
where c is speed of light, L is wavelength and f is frequency, are crucial. If c'=c=300000km/s we have
c = L'f' /1/
If the speed of light is variable and, as Einstein showed in 1911, obeys the equation c'=c(1+V/c^2), where V is the gravitational potential, /1/ is wrong and we have, instead,
L' = L ; c' = Lf' /2/
Clearly /1/ and /2/ are incompatible and here the strangeness begins. Physicists usually assume that /1/ is true but rarely say /2/ is wrong. Sometimes they give praise to Einstein's 1911 equation c'=c(1+V/c^2) and therefore implicitly assume that /2/ is true and /1/ is wrong. Yet physicists would never openly discuss the implications of /2/: they suspect that this particular discussion has something to do with a prophecy of Einstein's:
"If the speed of light is the least bit affected by the speed of the light source, then my whole theory of relativity and theory of gravity is false."
THANK YOU PENTCHO!