Bonjour,

1-Vous me copierez 100 fois :
"Le red shift cosmologique est sans rapport avec le red shift
gravitationnel"
2- Vous me copierez 500 fois :
"c" est la vitesse limite.
:-)
Au revoir.
Bernard Lempel
http://lempel.net

"Pentcho Valev" <pvalev***yahoo.com> a écrit dans le message de news:
4ea6c85d-f59d-4440-95db-2a3cbea30b93...oglegroups.com...
On Aug 29, 7:49 pm, "Lempel" <Lempel.Bern...***orange.fr> wrote in
fr.sci.physique:
> Bonjour,
>
> Un red shift n'implique pas une diminution de la vitesse de la lumière.

Stephen Hawking, UNE BREVE HISTOIRE DU TEMPS, Flammarion, 1989, p. 53:
"Comme la lumière voyage vers le haut dans le champ gravitationnel de
la Terre, elle perd de l'énergie, et ainsi sa fréquence baisse."

Est-ce qu'il est correct de modifier cela de la manière suivante:

"Comme la lumière voyage vers le haut dans le champ gravitationnel de
la Terre, elle perd de VITESSE, et ainsi sa fréquence baisse."

Ce texte pourrait être utile:

http://www.blazelabs.com/f-g-gcont.asp
"So, faced with this evidence most readers must be wondering why we
learn about the importance of the constancy of speed of light. Did
Einstein miss this? Sometimes I find out that what's written in our
textbooks is just a biased version taken from the original work, so
after searching within the original text of the theory of GR by
Einstein, I found this quote:"In the second place our result shows
that, according to the general theory of relativity, the law of the
constancy of the velocity of light in vacuo, which constitutes one of
the two fundamental assumptions in the special theory of relativity
and to which we have already frequently referred, cannot claim any
unlimited validity. A curvature of rays of light can only take place
when the velocity of propagation of light varies with position. Now we
might think that as a consequence of this, the special theory of
relativity and with it the whole theory of relativity would be laid in
the dust. But in reality this is not the case. We can only conclude
that the special theory of relativity cannot claim an unlimited domain
of validity ; its results hold only so long as we are able to
disregard the influences of gravitational fields on the phenomena
(e.g. of light)." - Albert Einstein (1879-1955) - The General Theory
of Relativity: Chapter 22 - A Few Inferences from the General
Principle of Relativity-. Today we find that since the Special Theory
of Relativity unfortunately became part of the so called mainstream
science, it is considered a sacrilege to even suggest that the speed
of light be anything other than a constant. This is somewhat
surprising since even Einstein himself suggested in a paper "On the
Influence of Gravitation on the Propagation of Light," Annalen der
Physik, 35, 1911, that the speed of light might vary with the
gravitational potential. Indeed, the variation of the speed of light
in a vacuum or space is explicitly shown in Einstein's calculation for
the angle at which light should bend upon the influence of gravity.
One can find his calculation in his paper. The result is c'=c(1+V/c^2)
where V is the gravitational potential relative to the point where the
measurement is taken. 1+V/c^2 is also known as the gravitational
redshift factor."

Pentcho Valev
pvalev***yahoo.com

bonsoir,

avant il buvait un rosé bien vinaigré et maintenant il vire au gros rouge
qui tache ....

bonne nuit

--

Lucien COSTE

"Lempel" <Lempel.Bernard***orange.fr> a écrit dans le message news:
48bd873f$0$950$ba4acef3***news.orange.fr...
> Bonjour,
>
> 1-Vous me copierez 100 fois :
> "Le red shift cosmologique est sans rapport avec le red shift
> gravitationnel"
> 2- Vous me copierez 500 fois :
> "c" est la vitesse limite.
> :-)
> Au revoir.
> Bernard Lempel
> http://lempel.net
>
> "Pentcho Valev" <pvalev***yahoo.com> a écrit dans le message de news:
> 4ea6c85d-f59d-4440-95db-2a3cbea30b93...oglegroups.com...
> On Aug 29, 7:49 pm, "Lempel" <Lempel.Bern...***orange.fr> wrote in
> fr.sci.physique:
> > Bonjour,
> >
> > Un red shift n'implique pas une diminution de la vitesse de la lumière.
>
> Stephen Hawking, UNE BREVE HISTOIRE DU TEMPS, Flammarion, 1989, p. 53:
> "Comme la lumière voyage vers le haut dans le champ gravitationnel de
> la Terre, elle perd de l'énergie, et ainsi sa fréquence baisse."
>
> Est-ce qu'il est correct de modifier cela de la manière suivante:
>
> "Comme la lumière voyage vers le haut dans le champ gravitationnel de
> la Terre, elle perd de VITESSE, et ainsi sa fréquence baisse."
>
> Ce texte pourrait être utile:
>
> http://www.blazelabs.com/f-g-gcont.asp
> "So, faced with this evidence most readers must be wondering why we
> learn about the importance of the constancy of speed of light. Did
> Einstein miss this? Sometimes I find out that what's written in our
> textbooks is just a biased version taken from the original work, so
> after searching within the original text of the theory of GR by
> Einstein, I found this quote:"In the second place our result shows
> that, according to the general theory of relativity, the law of the
> constancy of the velocity of light in vacuo, which constitutes one of
> the two fundamental assumptions in the special theory of relativity
> and to which we have already frequently referred, cannot claim any
> unlimited validity. A curvature of rays of light can only take place
> when the velocity of propagation of light varies with position. Now we
> might think that as a consequence of this, the special theory of
> relativity and with it the whole theory of relativity would be laid in
> the dust. But in reality this is not the case. We can only conclude
> that the special theory of relativity cannot claim an unlimited domain
> of validity ; its results hold only so long as we are able to
> disregard the influences of gravitational fields on the phenomena
> (e.g. of light)." - Albert Einstein (1879-1955) - The General Theory
> of Relativity: Chapter 22 - A Few Inferences from the General
> Principle of Relativity-. Today we find that since the Special Theory
> of Relativity unfortunately became part of the so called mainstream
> science, it is considered a sacrilege to even suggest that the speed
> of light be anything other than a constant. This is somewhat
> surprising since even Einstein himself suggested in a paper "On the
> Influence of Gravitation on the Propagation of Light," Annalen der
> Physik, 35, 1911, that the speed of light might vary with the
> gravitational potential. Indeed, the variation of the speed of light
> in a vacuum or space is explicitly shown in Einstein's calculation for
> the angle at which light should bend upon the influence of gravity.
> One can find his calculation in his paper. The result is c'=c(1+V/c^2)
> where V is the gravitational potential relative to the point where the
> measurement is taken. 1+V/c^2 is also known as the gravitational
> redshift factor."
>
> Pentcho Valev
> pvalev***yahoo.com
>
>