Discussion in 'Physics & Math' started by hardalee, Sep 16, 2015.

1. ### paddoboyValued Senior Member

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I echo those remarks, although still waiting myself for replies from Professor Will.

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3. ### paddoboyValued Senior Member

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I would also like to hear from Schmelzer re Professor Robertson's reply.

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5. ### SchmelzerValued Senior Member

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Sorry, but the arguments given by Robertson do not make sense for me.

The equivalence principle is not exact, because there is nonzero curvature in a gravitational field. If one requires zero curvature, this would mean the gravitational field is trivial, and there simply is no gravity.

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Thanks.

8. ### OnlyMeValued Senior Member

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Schmelzer, first I know nothing of Yilmas gravity that has not been discussed here and it has been years since I, myself worked with EFE.

Still I am puzzled by your above comment. Quoting Prof. Robertson from tashja's post, it does not read to me that his comments rely on zero curvature as far as the equivalence principle is concerned. I quoted the whole paragraph, but the portion I placed in bold is where my confusion with your statement arises. The portion in red specifically refers to a static gravitational field not zero curvature.

Perhaps the notes he mentioned would be of some use.., or am I just missing something?

Q-reeus likes this.
9. ### Q-reeusBannedValued Senior Member

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Is that a genuine response? You must know full well the EP is only ever meant to be a local statement - everyone who knows anything about gravity recognizes that globally the gravitational field of a body cannot be made equivalent to a *uniform* acceleration. In #398 I yet again gave the link to Alley ppt article which nicely sets out the derivation of exponential redshift expression. Feel free to 'pick it apart' and show how the usual GR redshift expression could be preferred on a logical as opposed to a successful PR campaign sociological basis. Prof. Robertson's statement is perfectly accurate and given in the proper context - correspondence *limit*. Obviously one expects opposition to such a death blow against Holy GR from its legion of devotees, but such should give the appearance of some sophistication.

Amusing and perhaps for you a warning sign that of all people here you get an 'I like' from paddoboy, plus a follow-up 'Thanks' posting!!!!

10. ### paddoboyValued Senior Member

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You appear to want to invoke whatever conspiracies that support your agenda to muddy the waters. A couple of points...I asked Schmelzer to reply to the Professor's post simply for his view. Like his post? I mean with the cozy relationship between you and the god, I wouldn't be raising any aspect of me and Schmelzer over one like re a "theory" [Yilmaz], that irrespective of the Professor's opinion, is still barely creating a ripple over 20 years or more. :shrug:

11. ### Q-reeusBannedValued Senior Member

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You asked Schmelzer?! Wow! The maxim rings true here - 'My enemy's enemy is my friend'. But are you still too proud to drop that long exposed as way-out '20 years' bit? My 'agenda' btw has always been truth regardless of popularity. You could do with adopting such 'agenda' yourself. Fat chance. I take it your stooping to asking help from someone you have poured out torrents of derision and invective on, is stark admission you have no personal capacity to challenge anything Prof. Robertson has claimed? No need to answer - the answer is obvious.

Last edited: Nov 1, 2015
12. ### paddoboyValued Senior Member

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Your agenda is obvious and as I have exposed in the past...grow up .