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Natural Science Forum / Physics / Relativity / August 2007Gravitational waves
Why graviton "has spin 2"? Tracing a parallelism between gravitational waves and gravitons... what can be seen as <<the spin 2>> for the wave? Dear marcofuics: > Why graviton "has spin 2"? It is a requirement of the "geometry". Some good hits on Google with: graviton "spin 2" > Tracing a parallelism between gravitational > waves and gravitons... > what can be seen as <<the spin 2>> for the > wave? The expectation that they can only convey momentum in quadrature. Meaning that gravity waves do not express their effects in the orbital plane of two bodies, or aligned with the poles, but in between. My guess. David A. Smith > Dearmarcofuics: > > > Why graviton "has spin 2"? > > It is a requirement of the "geometry". Some good hits on Google with: > graviton "spin 2" :)) My questin arises from the fact that a quantum theory of gravitation does not exist, so the idea of a graviton2spinned is just a resemblance, a trial test??? Maybe captured from the GR evidence that gravitational waves have some peculiarities: maybe for the fact they base on a tensorial 4X4 aspect? > The expectation that they can only convey momentum in quadrature. > Meaning that gravity waves do not express their effects in the orbital > plane of two bodies, or aligned with the poles, but in between. My > guess. hmmmmm A question: An entity, with no mass, whatever its spin could be, has only 2 states of polarization? For example, a graviton --> spin 2 --> ISuppose: States 2;1;0;-1;-2 But it seems that graviton has only 2 polarization Null mass means only 2 states? Impossibility to observe that body as at rest? And why then when could think at a fermion (half integer spin) with mass? All the fermions have a not null mass? Dear marcofuics: > > Dearmarcofuics: > [quoted text clipped - 9 lines] > idea of a graviton2spinned is just a > resemblance, a trial test??? It is an attempt to create an exchange particle for quantum mechanics to achieve gravitation, and sneak spacetime into the back door. > Maybe captured from the GR evidence that > gravitational waves have some peculiarities: > > maybe for the fact they base on a tensorial > 4X4 aspect? Study more and let us all know. I think the quest for the graviton is doomed, but who really knows? > > The expectation that they can only convey > > momentum in quadrature. Meaning that [quoted text clipped - 8 lines] > An entity, with no mass, whatever its spin > could be, has only 2 states of polarization? Photons fit this description, substituting "2 spin states" for "2 states of polarization". Polarization is a system thing, so limiting polarization to two values is incorrect for a photon. > For example, a graviton --> spin 2 --> > I Suppose: States 2;1;0;-1;-2 [quoted text clipped - 10 lines] > mass? > All the fermions have a not null mass? You are over my head. You had not received a responseto yoru original question for some time, so I figured I'd take a stab at an answer for you. Sorry. This may not be the best group to investigate quantum mechanics on... perhaps sci.physics.research (which is moderated). David A. Smith |
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