Re: what is the mechanism of gravity

"John Henckel" <john.NoSP@xxxxxxxxxxxxxx> wrote in message news:45a27011$0$4826$88260bb3@xxxxxxxxxxxxxxxxxxxx
Sorry if this is too obvious, but I really would like a knowledgeable answer.

on physicsforums.com, "yogi" says...

>> Einstein's theories are based upon the notion that the forces
produced between physically separated objects are due to a modification (conditioning) of space, and not to traveling entities. The appeal of the graviton is probably due in a large part to the success of QED

however, "pbm_phy" says...

>> General Relativity is often mis-stated as being the relativistic
explanation of gravity. It is not. ... The theory does not offer an explanation of gravitation; that lies outside its scope, and does not even hint at a mechanism.

which is correct?

Seems like the first one is more correct if you change "space" to "spacetime" but we really don't know yet.

Newton's first law says things travel in straight lines. GR defines "straight". I have always thought this to be an explanation for the mechanism of gravity. If it isn't, why not?

The "mechanism" that GR offers is that spacetime geometry is curved by the presence of matter-energy. And there is not much doubt that that is correct. However, you run into subtle things with what spacetime is in the first place and how its geometry can be affected. Is spacetime simply the mapping of how quantum objects interact? Do we know what all the quantum objects are and/or might be? No. Is the graviton one of them? I suspect that the graviton is not a quantum "object" persee but maybe more like a phonon. A "quasi-quantum object"?

FrediFizzx

Quantum Vacuum Charge papers;
http://www.vacuum-physics.com/QVC/quantum_vacuum_charge.pdf
or postscript
http://www.vacuum-physics.com/QVC/quantum_vacuum_charge.ps
http://www.arxiv.org/abs/physics/0601110
http://www.vacuum-physics.com
The path to truth is thinner than a razor's edge.

.

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