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hecd2
Guest
Michael Forrest said:Alec: If of course, Bob rejects GR, then he is left with Newtonian mechanics considerations, several of which I and others posted and are unanswerable. The earth cannot possibly be at rest in absolute Newtonian space.
In either case, a GR or GR-like metric universe or a Newtonian universe, there is no physical basis on which to claim that the earth is ‘at rest’ and the ‘centre’ of the universe.
Alec
R. Sungenis: Alec has made a pedantic display of theories and terms but he has said nothing that proves his case.
It is not possible to have a sensible debate with someone whose lack of knowledge of the subject under discussion is as obvious and extreme as Bob’s is. Not only is he clearly ignorant about important specifics on this topic, but his general lack of scientific knowledge and his obvious disdain for science would convert this discussion on my part into the education of a reluctant pupil, a task that is far more onerous than I am willing to undertake. One example will suffice. It shows such ignorance of such an elementary and fundamental concept of mechanics, that it, on its own, utterly disqualifies Bob from any serious discussion on matters pertaining to gravitation and cosmology.
Code:
I wrote: “The surface of the earth is very plainly not an inertial frame so it cannot have any special privilege to be at a centre or at rest.” To which Bob replied: “Says who? Where has Alec proven for us in this dialogue that the Earth cannot be the inertial frame at the center and at rest? … if we take the Earth as the ‘local inertial frame’ it has a ‘greater claim for not being in rotation,’ but then, out of nowhere, Alec concludes that the ‘local inertial frame' cannot be 'the earth...unmoving at the center of the universe’ " In other words Bob wants me to *prove* that the surface of the earth cannot be at rest in an inertial frame. Now, anyone who has the slightest acquaintance with classical mechanics and all metric theories of gravitation will know that the surface of the earth cannot represent an inertial frame by the definition of the term, which is a frame in which an object at rest experiences no inertial forces *whatever the source of those forces might be*. Equivalent definitions include a frame in free fall or a frame in which geodesics are classical straight lines in a flat spacetime – all of these definitions are equivalent and the surface of the earth doesn’t satisfy a single one – it cannot be at rest in an inertial frame – by definition of the term. If Bob doesn't know this, what hope for the quality of the rest of his argument?
Bob’s entire argument relies on the equivalence of a) the earth rotating with respect to the star frame and b) the star frame rotating with respect to the earth. This equivalence occurs only in GR. (Note Lense and Thirring produced solutions to the Einstein field equations) and is not valid in an absolute space. Since Bob rejects GR, and cleaves to an absolute space he is left with a logical dog’s breakfast. He can’t have it both ways.
In truth there is little more that needs to be said. Why flog a dead horse? I leave you with a quote from Bob which displays his disdain for science and scientists and particularly for scientific terms that he quite obviously does not begin to understand: ‘In the end, Relativity and its cousins (Minkowski space, Friedmann-metric, Killing vectors) is [sic] just a desperate attempt to find an absolute when there is none available…God gave us an absolute reference frame when He put the earth in the center, but men think they know better ’.
Bob bases his belief that the earth is the unmoving centre of the universe not on science but on his belief in his interpretation of literal biblical inerrancy. That’s fine, and he’s entitled to have whatever religious belief he wishes, but in scientific terms, his geocentrism has no more validity than an unshakeable belief in pink unicorns.
Alec
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