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Article #5761

Re: Fermat's principle and curved spacetime

#5761
From: Ockham
Date: Sat, 26 Jan 2008 20:25
105 lines
5325 bytes
"Dieter Heidorn" <d.heidorn@t-online.de> wrote in message 
news:fng2ih$88t$02$1@news.t-online.com...
| Koobee Wublee schrieb:
| > On Jan 23, 1:09 pm, Dieter Heidorn schrieb:
| >
| >>Koobee Wublee schrieb:
| >
| >>>These are not experimentations on deflection but measurements in speed
| >>>delay or rather gravitational time delay.  <shrug>
| >>
| >>These _are_ experiments on light deflection. Please have a look at
| >>
| >>http://arxiv.org/abs/gr-qc/0510072
| >>
| >>pages 33 - 35.
| >
| > Have you not noticed that there are all claims and no specific
| > experiments shown with analyzable data given?
| >
|
| See page 1:
|
| "Abstract
| The status of experimental tests of general relativity and of
| theoretical frameworks for analysing them is
|      _reviewed_."
|
| To all listed experiments are given references, for instance concerning
| light deflection:
|
| [165] Lebach, D.E., Corey, B.E., Shapiro, I.I., Ratner, M.I., Webber,
| J.C., Rogers, A.E.E., Davis, J.L., and Herring, T.A., �Measurement of
| the solar gravitational deflection of radio waves using
| very-long-baseline interferometry�, Phys. Rev. Lett., 75, 1439�1442, 
(1995).
|
| [241] Shapiro, S.S., Davis, J.L., Lebach, D.E., and Gregory, J.S.,
| �Measurement of the solar gravitational deflection of radio waves using
| geodetic very-long-baseline interferometry data, 1979�1999�, Phys. Rev.
| Lett., 92, 121101, (2004).
|
| [116] Froeschl�e, M., Mignard, F., and Arenou, F., �Determination of the
| PPN parameter gamma with the Hipparcos data�, in Proceedings from the
| Hipparcos Venice �97 Symposium, Proceedings of the symposium held on
| 13-16May 1997, (ESA, Noordwijk, Netherlands, 1997).
|
| ...and so on.
|
| >>The distance Earth - Venus when Venus stands between Earth and
| >>Sun can be measured by measuring the travel time of reflected radar
| >>signals. In combination with the data of Venus' orbit you get the
| >>distance needed for the Shapiro-Experiment.
| >
| > I am still not convinced this 240uSec is qualified.
| >
|
| Irwin I. Shapiro et al.: Fourth Test of General Relativity: New Radar
| Result. In: Physical Review Letters 26, 1971, S. 1132 - 1135
|
| > Thus, the delay time is
| >
| > dt = (4 G M / c^3) ln(4 a_E a_V / R^2)
| >
|
| Agreed :-)
|
| >>Starting with the equation
| >>
| >>c' = c (1 + kV/c^2)
| >>
| >>     k = 1: 1911
| >>     k = 2: 1916
| >
| > However, this does not mean
| >
| > C(r) = c (1 + 2 U), k = 2
| >
| > Or
| >
| > C(r) = c (1 + U), k = 1
| >
| > Under the concept of GR, the speed of light must be the same
| > everywhere.  That is
| >
| > C(r) = c
| >
|
| The difference between local and non-local must be considered - but we
| had that discussed already. I think we can end here.
|
| Thanks for the discussion.
|
| -----
|
| I have collected my remarks concerning variable speed of light in GR on
| my homepage. Maybe you're interested to take a look:
|
| http://www.d1heidorn.homepage.t-online.de/Physik/VSL/VSL.html
|
| Dieter Heidorn


"The variability of the speed of light in GR is not to be understood"
Do you often write in Irish?| 
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From: "Ockham" <My@Razor.Shaves>
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Subject: Re: Fermat's principle and curved spacetime
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