Article View: sci.physics.relativity
Article #5761Re: Fermat's principle and curved spacetime
From: Ockham
Date: Sat, 26 Jan 2008 20:25
Date: Sat, 26 Jan 2008 20:25
105 lines
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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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X-Google-Thread: 10f545,e60ad8b8bd890c74 X-Google-Thread: 10b271,4fd262761489fde X-Google-Thread: f74ae,4fd262761489fde X-Google-Thread: fa4c1,4fd262761489fde X-Google-Thread: 1139f8,4fd262761489fde X-Google-Attributes: gid10f545,gid10b271,gidf74ae,gidfa4c1,gid1139f8,public,usenet X-Google-Language: ENGLISH,CP1252 Path: arc1-ca.pugleaf.net!g2news1.google.com!news3.google.com!proxad.net!feeder1-2.proxad.net!news.mixmin.net!border2.nntp.ams.giganews.com!nntp.giganews.com!pe2.news.blueyonder.co.uk!blueyonder!pe1.news.blueyonder.co.uk!blueyonder!fe3.news.blueyonder.co.uk.POSTED!53ab2750!not-for-mail From: "Ockham" <My@Razor.Shaves> Newsgroups: sci.physics.relativity,sci.physics,sci.astro,fr.sci.physique,fr.sci.maths References: <acc87498-7d1a-4bf8-b205-e24b29b6f04b@s8g2000prg.googlegroups.com> <v2Wjj.38861$lD6.27743@newssvr27.news.prodigy.net> <f45cdd6a-6cba-49f6-aef9-089ac65e4d1b@k2g2000hse.googlegroups.com> <fmr47v$fqo$03$1@news.t-online.com> <3783ed0d-aae7-4f13-b98e-cfe1317f8846@i29g2000prf.googlegroups.com> <fmsv04$dkv$01$1@news.t-online.com> <a3fb1ad6-5537-4bc1-a0c3-c18a27fcad78@1g2000hsl.googlegroups.com> <fmvvcj$op6$01$1@news.t-online.com> <f9b17591-1643-485f-a111-5820f4769210@d70g2000hsb.googlegroups.com> <fn5668$age$01$1@news.t-online.com> <a24ea188-0152-49a6-93f2-b5dc67ce0cdb@i7g2000prf.googlegroups.com> <fn8adt$2im$00$1@news.t-online.com> <70d76ea7-ff98-4c90-8ba2-e54c1df3126c@d21g2000prf.googlegroups.com> <fng2ih$88t$02$1@news.t-online.com> Subject: Re: Fermat's principle and curved spacetime Lines: 106 MIME-Version: 1.0 Content-Type: text/plain; charset="Windows-1252" Content-Transfer-Encoding: 8bit X-Priority: 3 X-MSMail-Priority: Normal X-Newsreader: Microsoft Outlook Express 6.00.2900.3138 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3198 Message-ID: <qHMmj.283101$S37.243104@fe3.news.blueyonder.co.uk> Date: Sat, 26 Jan 2008 20:25:58 GMT NNTP-Posting-Host: 82.34.70.125 X-Complaints-To: http://netreport.virginmedia.com X-Trace: fe3.news.blueyonder.co.uk 1201379158 82.34.70.125 (Sat, 26 Jan 2008 20:25:58 GMT) NNTP-Posting-Date: Sat, 26 Jan 2008 20:25:58 GMT