‘We listen up “sequence principle requires this new graviton” thing a lot, nevertheless merely reason I have seen would be the fact it predicts a good spin-2 particle.’ – Deprive Knop, ,
‘A good massless spin 2 particle is pretty much expected to getting a graviton from the certain results which go to Feynman, I believe.’ – Sequence theorist Aaron Bergman, , (Actually Richard P. )
‘Rob, in addition to the sophisticated reason a massless spin 2 particle must be the graviton, there are also specific calculations indicating you to definitely forgone completion …’ – Moshe, ,
‘Aaron Bergman authored: ‘Good massless twist dos particle is pretty much expected to become a graviton because of the some performance which go returning to Feynman, I do believe.’
Generally you don’t have that many of him or her lying around, no matter if I am not sure the rigorous statement compared to that feeling
‘Any kind of this type of results are, they have to keeps more assumptions. … Most of these have nothing related to gravity. An effective graviton must relate genuinely to various other profession – as well as in a highly certain method.
‘So, it would be interesting to look at the outcome you might be talking in the, to see what they actually say. Most likely the Einstein-Hilbert action ‘s the “the very least nonrenormalizable” way for a chance-dos particle to interact along with other dirt chemistry… any sort of this means?’ – Teacher John Baez, ,
‘B writes: ‘Brand new twist dos particle can only just few for the opportunity-impetus tensor – because the the law of gravity really does.’Oh? As to the reasons?’ – Teacher John Baez, ,
‘…the main point is the massless twist-dos occupation is demonstrated by the a shaped a few-index [rank-2] tensor that have a specific assess symmetry. … Therefore the origin have to be a symmetric divergenceless a couple of-list tensor. ‘ – Professor Sean Carroll, ,
‘There is a general belief, reinforced by statements in standard textbooks, that: (i) one can obtain the full non-linear Einstein’s theory of gravity by coupling a massless, spin-2 field hab self-consistently to the total energy momentum tensor, including its own; (ii) this procedure is unique and leads to Einstein-Hilbert action and (iii) it only uses standard concepts in Lorentz invariant field theory and does not involve any geometrical assumptions. After providing several reasons why such beliefs are suspect – and critically re-examining several previous attempts – we provide a detailed analysis aimed at clarifying the situation. First, we prove that it is impossible to obtain the Einstein-Hilbert (EH) action, starting from the standard action for gravitons in linear theory and iterating repeatedly. … Second, we use the Taylor series expansion of the action for Einstein’s theory, to identify the tensor Sab, to which the graviton field hab couples to the lowest order (through a term of the form Sabhab in the lagrangian). We show that the second rank tensor Sab is not the conventional energy momentum tensor Tab of the graviton and provide an explanation for this feature. Third, we construct the full nonlinear Einstein’s theory with the source being spin-0 field, spin-1 field or relativistic particles by explicitly coupling the spin-2 field to this second rank tensor Sab order by order and summing up the infinite series. Finally, we construct the theory obtained by self consistently coupling hab to the conventional energy momentum tensor Tab order by order and show that this does not lead to Einstein’s theory.’
Feynman points out from the Feynman Lectures on the Gravitation, page 31, that gravitons don’t need to become spin-dos, which includes maybe not already been seen
Now we’ll see a great predictive proof of the brand new acceleration out of new world and that originated through to the observation the market is actually speeding up, a good = Hc.
Notice that the external acceleration regarding repulsion was opposed because of the inwards velocity because of attraction out of the law of gravity, therefore, the info is appearing an absence of speed. Since the cosmologists realized in the Friedmann metric out of standard relativity one the brand new market meltdown are delaying (extension can be decelerating) most importantly ranges, the absence of you to definitely deceleration created the existence of an acceleration. For this reason, while the Nobel Laureate Phil Anderson claims, new noticed fact concerning your imaginary cosmological lingering and you can black energy is simply one: