‘We listen up “string principle needs the new graviton” procedure a lot, although merely explanation I’ve seen would be the fact they forecasts an effective spin-dos particle.’ – Deprive Knop, ,
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‘An effective massless twist dos particle is in fact needed to feel an excellent graviton because of the specific show which go returning to Feynman, I do believe.’ – Sequence theorist Aaron Bergman, , (Indeed Richard P. )
‘Deprive, plus all of the higher level good reason why a beneficial massless twist 2 particle must be the graviton, there are even specific computations indicating that forgone achievement …’ – Moshe, ,
‘Aaron Bergman authored: ‘Good massless spin 2 particle is in fact needed to become a beneficial graviton from the particular efficiency that go to Feynman, In my opinion.’
Essentially you don’t have a large number of them sleeping up to, no matter if I’m not sure the rigorous report to this impression
‘Any these types of answers are, they need to enjoys additional assumptions. … Each one of these have nothing related to the law of gravity. A good graviton has to interact with other field – along with an extremely certain means.
‘Thus, it would be fascinating to look at the results you are talking on, and view what they in reality say. Most likely the Einstein-Hilbert step ‘s the “least nonrenormalizable” means for a chance-2 particle to activate with other dust… any that implies?’ – Teacher John Baez, ,
‘B produces: ‘This new twist dos particle can simply pair into time-energy tensor – since the gravity do.’Oh? Why?’ – Teacher John Baez, ,
‘…the main point is the massless spin-2 career is actually discussed from the a symmetric a couple-list [rank-2] tensor which have a certain assess balance. … So their provider should be a shaped divergenceless a few-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 explains in the Feynman Lectures towards Gravitation, page 30, that gravitons do not need to be spin-2, that has not become observed
Now we shall see an excellent predictive proof of the brand new speed out-of the brand new universe and therefore originated before observance that the market was quickening, a beneficial = Hc.
Observe that the new external velocity out of repulsion try compared because of the inward velocity because of destination off gravity, so that the information is proving an absence of speed. Since the cosmologists realized regarding the Friedmann metric of general relativity you to definitely the latest credit crunch are going to be slowing down (expansion are going to be decelerating) in particular ranges, its lack of you to deceleration created the clear presence of a velocity. Thus, just like the Nobel Laureate Phil Anderson states, new seen facts regarding the fictional cosmological lingering and you may black energy is just one: