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Article #16180Re: Why does light bend under gravity?
From: Sue...
Date: Sun, 16 Mar 2008 22:55
Date: Sun, 16 Mar 2008 22:55
53 lines
4391 bytes
4391 bytes
On Mar 16, 6:04 pm, Tom Roberts <tjroberts...@sbcglobal.net> wrote: > > I mentioned the solar atmosphere because some people think the Shapiro > time delay is due to it (such an atmosphere has an altitude-varying > index of refraction, which _could_ behave like the Shapiro time delay). > It's just that actual measurements of the solar atmosphere and its > properties completely refute that claim. Another way to look at it is that GR *predicts* the solar plasma because energy density has a relation to a volume of space-time. Bruno Bertotti seemed to have learned more about solar plasma than light bending from the Cassini path, IMHO. <<The findings appear in the Sept. 25 issue of the journal Nature >> http://www.universetoday.com/2003/10/03/cassini-confirms-general-relativity/ << The plasma noise is highly variable over all time scales, depending primarily on solar activity, in par- ticular solar flares, coronal holes, and solar rotation. Because of stochastic plasma variability, the real as- sessment of how well the dual-band plasma correction works can be determined only by doing it. >> "Measurement of the PPN Parameter with Radio Signals from the Cassini Spacecraft at X- and Ka-Bands" http://www.slac.stanford.edu/econf/C041213/papers/0305.PDF << It is interesting to note that, since plasma effects near the Sun need to be eliminated to better than one part in 10^4, the usual expression for the frequency correction (7) (where L is the optical path with suitable refractive index) is not accurate enough. Relativistic corrections O.v=c/ are needed, in particular the one arising from the difference between the emission and the receiving time. The fully relativistic expression of the Doppler effect in a moving medium has been derived with the Hamiltonian formalism in [31]. >> "Doppler Measurement of the Solar Gravitational Deflection" http://www.sp.ph.ic.ac.uk/~giacomo/Papers/doppler_abs.html It may be a half full glass to some, a half empty glass to others but I see little in that to "completely refute" the effects of the solar plasma. Sue... > > Tom Roberts
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X-Google-Thread: 10b271,1ea0cb1d54d3d906 X-Google-Thread: 10f545,2d47498f99950055 X-Google-Thread: f6c41,2d47498f99950055 X-Google-Thread: fa4c1,c0039b44052ddae9 X-Google-Thread: f74ae,c0039b44052ddae9 X-Google-Attributes: gid10b271,gid10f545,gidf6c41,gidfa4c1,gidf74ae,public,usenet X-Google-Language: ENGLISH,ASCII Path: arc1-ca.pugleaf.net!g2news1.google.com!postnews.google.com!d62g2000hsf.googlegroups.com!not-for-mail From: "Sue..." <suzysewnshow@yahoo.com.au> Newsgroups: sci.physics,sci.physics.relativity,sci.physics.particle,fr.sci.physique,sci.astro Subject: Re: Why does light bend under gravity? Date: Sun, 16 Mar 2008 15:55:56 -0700 (PDT) Organization: http://groups.google.com Lines: 54 Message-ID: <1da2434d-d5f2-42b0-8446-29bf7bdd10ef@d62g2000hsf.googlegroups.com> References: <1de25376-cbdf-4a88-9c24-635b73e962f0@e60g2000hsh.googlegroups.com> <k887s35r0tqpss2mmaj14d9v70qblsjt3v@4ax.com> <7ad9324e-a185-4be5-8d37-36608dda682a@s37g2000prg.googlegroups.com> <6oe7s3t3ffk34ik95onbdq5i7ho1man8vh@4ax.com> <5d081222-5b36-4e82-b8d7-8900c2acbbc4@d4g2000prg.googlegroups.com> <L_mBj.16850$Ch6.2540@newssvr11.news.prodigy.net> <4a84042b-1718-45a4-82f9-0e2b9fa12240@x41g2000hsb.googlegroups.com> <toRBj.16222$xq2.10827@newssvr21.news.prodigy.net> <a2ca4f30-9c55-4fa6-a0a1-cc7ad49e36a4@s37g2000prg.googlegroups.com> <e2b37da4-49a5-40da-95d8-c48add78539d@8g2000hse.googlegroups.com> <350f08c0-cbc4-43ca-9ece-629159f22125@h11g2000prf.googlegroups.com> <OzcDj.20839$Ej5.5102@newssvr29.news.prodigy.net> <35e2ae0d-b9b5-4f10-9dc2-b2cccd1bdf17@s12g2000prg.googlegroups.com> <tQgDj.1401$qT6.838@nlpi070.nbdc.sbc.com> NNTP-Posting-Host: 69.34.144.98 Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable X-Trace: posting.google.com 1205708157 7957 127.0.0.1 (16 Mar 2008 22:55:57 GMT) X-Complaints-To: groups-abuse@google.com NNTP-Posting-Date: Sun, 16 Mar 2008 22:55:57 +0000 (UTC) Complaints-To: groups-abuse@google.com Injection-Info: d62g2000hsf.googlegroups.com; posting-host=69.34.144.98; posting-account=wigfZgkAAACDgITarXffzxJygX81YRSs User-Agent: G2/1.0 X-HTTP-UserAgent: Mozilla/4.0 (compatible; MSIE 6.0; Windows 98),gzip(gfe),gzip(gfe)