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Graviton version of FRW Spacetime
In quantum theory with gravitons, Spacetime curvature is just an illusion, what we really have are spin 2 particles and fields in flat Spacetime. So to those familiar with this concept. How do you decompose the curved Spacetime of FRW model into a flat one with spin 2 fields? And how does it expand? Thanks. |
#2
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Graviton version of FRW Spacetime
Joe Wisherman wrote in news:7fe8f271-9af7-4366-
: In quantum theory with gravitons, Spacetime curvature is just an illusion, what we really have are spin 2 particles and fields in flat Spacetime. So to those familiar with this concept. How do you decompose the curved Spacetime of FRW model into a flat one with spin 2 fields? And how does it expand? Thanks. You don't. The theory does not work, which is why we don't have a quantum theory of gravitation. |
#3
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Graviton version of FRW Spacetime
On Mar 3, 8:26*am, eric gisse wrote:
Joe Wisherman wrote in news:7fe8f271-9af7-4366- : In quantum theory with gravitons, Spacetime curvature is just an illusion, what we really have are spin 2 particles and fields in flat Spacetime. So to those familiar with this concept. How do you decompose the curved Spacetime of FRW model into a flat one with spin 2 fields? And how does it expand? Thanks. You don't. The theory does not work, which is why we don't have a quantum theory of gravitation. It is the particle that is the illusion... Mitchell Raemsch |
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Graviton version of FRW Spacetime
On Mar 4, 12:26*am, eric gisse wrote:
Joe Wisherman wrote in news:7fe8f271-9af7-4366- : In quantum theory with gravitons, Spacetime curvature is just an illusion, what we really have are spin 2 particles and fields in flat Spacetime. So to those familiar with this concept. How do you decompose the curved Spacetime of FRW model into a flat one with spin 2 fields? And how does it expand? Thanks. You don't. The theory does not work, which is why we don't have a quantum theory of gravitation. First some basic. The basic idea is that spin-2 fields in flat spacetime can explain gravity without taking the geometric interpretation of GR. Here are the references. http://groups.google.com/group/sci.p...metrically+by# "Is spacetime really curved? Embedded somewhere? Message #4: "There's a fascinating analysis due to Deser ["Self-interaction and gauge invariance", General Relativity & Gravitation 1 (1970), 9-18; see also his later paper "Gravity from self-interaction in a curved background", Classical and Quantum Gravity 4 (1997), L99-L105], summarized in part 5 of box 17.2 of Misner, Thorne, & Wheeler's book. Quoting from that latter summary: "The Einstein equations may be derived nongeometrically by noting that the free, massless, spin-2 field equations [[for a field $\phi$]] [[...]] whose source is the matter stress-tensor $T_{\mu\nu}$, must actually be coupled to the \emph{total} stress-tensor, including that of the $\phi$-field itself. [[...]] Consistency has therefore led us to universal coupling, which implies the equivalence principle. It is at this point that the geometric interpretation of general relativity arises, since \emph{all} matter now moves in an effective Riemann space of metric $\mathcal{g}^{\mu\nu} = \eta^{\mu\nu} + h^{\mu\nu}$. .... [The] initial flat `background' space is no longer observable." In other words, if you start off with a spin-2 field which lives on a flat "background" spacetime, and say that its source term should include the field energy, you wind up with the original "background" spacetime being *unobservable in principle*, i.e. no possible observation can detect it. Rather, *all* observations will now detect the effective Riemannian space (which is what the usual geometric interpretation of general relativity posits from the beginning)." ****** See also the starting lines at : http://www.scribd.com/doc/81449908/F...time-Gravitons 5. Einstein's geometrodynamics viewed as the standard field theory for a field of spin 2 in an "unobservable flat spacetime" background (body of arguments) ending at " ....[The] initial flat 'background' space is no longer observable." In other words, this approach to Einstein's field equation can be summarized as "curvature without curvature" or - equally well - as "flat spacetime without flat spacetime"!" ---------------------------- If you have studied the above already, then I'll ask this: From the above. How does one decompose the FRW Expanding Universe into spin-2 field + flat spacetime? Remember Wheeler mentioned the FRW Universe is covered by harmonic coordinates and all harmonic coordinates can be modelled as spin-2 field + flat spacetime = curved spacetime. |
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Graviton version of FRW Spacetime
Joe Wisherman wrote in
: [snip] No. You do not understand. The spin-2 decomposition only works in weak field solutions to the field equations, which explicitly excludes FRW manifolds except when the difference between it and Minkowski spacetime is very, very small. The theory *DOES NOT WORK*. That's why it has largely been abandoned. You cannot directly quantize general relativity. Learn why science has not gone down the road before wandering down it yourself. |
#6
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Graviton version of FRW Spacetime
On 04/03/2012 1:36 AM, Joe Wisherman wrote:
On Mar 4, 12:26 am, eric wrote: Joe wrote in news:7fe8f271-9af7-4366- : In quantum theory with gravitons, Spacetime curvature is just an illusion, what we really have are spin 2 particles and fields in flat Spacetime. So to those familiar with this concept. How do you decompose the curved Spacetime of FRW model into a flat one with spin 2 fields? And how does it expand? Thanks. You don't. The theory does not work, which is why we don't have a quantum theory of gravitation. First some basic. The basic idea is that spin-2 fields in flat spacetime can explain gravity without taking the geometric interpretation of GR. The graviton is wishful thinking, and therefore by extension, for the same reason, SUSY and Superstring theory are also wishful thinking. Yousuf Khan |
#7
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Graviton version of FRW Spacetime
On Mar 6, 9:07*am, Yousuf Khan wrote:
On 04/03/2012 1:36 AM, Joe Wisherman wrote: On Mar 4, 12:26 am, eric *wrote: Joe *wrote in news:7fe8f271-9af7-4366- : In quantum theory with gravitons, Spacetime curvature is just an illusion, what we really have are spin 2 particles and fields in flat Spacetime. So to those familiar with this concept. How do you decompose the curved Spacetime of FRW model into a flat one with spin 2 fields? And how does it expand? Thanks. You don't. The theory does not work, which is why we don't have a quantum theory of gravitation. First some basic. The basic idea is that spin-2 fields in flat spacetime can explain gravity without taking the geometric interpretation of GR. The graviton is wishful thinking, and therefore by extension, for the same reason, SUSY and Superstring theory are also wishful thinking. * * * * Yousuf Khan- Hide quoted text - - Show quoted text - Why do we wish more nonsense that detracts from Einstein's achievment? What new problems are solved by particles of force? I say throw the particles in the garbage and use continuous fields for force. The speed limit in the universe is also the force limit. Force continuity. Mitchell Raemsch |
#8
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Graviton version of FRW Spacetime
On Mar 6, 10:21*pm, "
wrote: On Mar 6, 9:07*am, Yousuf Khan wrote: On 04/03/2012 1:36 AM, Joe Wisherman wrote: On Mar 4, 12:26 am, eric *wrote: Joe *wrote in news:7fe8f271-9af7-4366- : In quantum theory with gravitons, Spacetime curvature is just an illusion, what we really have are spin 2 particles and fields in flat Spacetime. So to those familiar with this concept. How do you decompose the curved Spacetime of FRW model into a flat one with spin 2 fields? And how does it expand? Thanks. You don't. The theory does not work, which is why we don't have a quantum theory of gravitation. First some basic. The basic idea is that spin-2 fields in flat spacetime can explain gravity without taking the geometric interpretation of GR. The graviton is wishful thinking, and therefore by extension, for the same reason, SUSY and Superstring theory are also wishful thinking. * * * * Yousuf Khan- Hide quoted text - - Show quoted text - Why do we wish more nonsense that detracts from Einstein's achievment? What new problems are solved by particles of force? I say throw the particles in the garbage and use continuous fields for force. The speed limit in the universe is also the force limit. Force continuity. Mitchell Raemsch i think yoda said that. something about the ultimate resolution of our universe. holog |
#9
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Graviton version of FRW Spacetime
On Mar 11, 1:19*am, holog wrote:
On Mar 6, 10:21*pm, " wrote: On Mar 6, 9:07*am, Yousuf Khan wrote: On 04/03/2012 1:36 AM, Joe Wisherman wrote: On Mar 4, 12:26 am, eric *wrote: Joe *wrote in news:7fe8f271-9af7-4366- : In quantum theory with gravitons, Spacetime curvature is just an illusion, what we really have are spin 2 particles and fields in flat Spacetime. So to those familiar with this concept. How do you decompose the curved Spacetime of FRW model into a flat one with spin 2 fields? And how does it expand? Thanks. You don't. The theory does not work, which is why we don't have a quantum theory of gravitation. First some basic. The basic idea is that spin-2 fields in flat spacetime can explain gravity without taking the geometric interpretation of GR. The graviton is wishful thinking, and therefore by extension, for the same reason, SUSY and Superstring theory are also wishful thinking. * * * * Yousuf Khan- Hide quoted text - - Show quoted text - Why do we wish more nonsense that detracts from Einstein's achievment? What new problems are solved by particles of force? I say throw the particles in the garbage and use continuous fields for force. The speed limit in the universe is also the force limit. Force continuity. Mitchell Raemsch i think yoda said that. something about the ultimate resolution of our universe. holog- Hide quoted text - - Show quoted text - The idea of the graviton is going backward in the guise of getting better than Einstein. Mithcell Raemsch |
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