N=8 Supergravity
n=8 super gravityIn four spacetime dimensions, N=8 Supergravity is the most symmetric quantum field theory which involves gravity and a finite number of fields It can be found from a dimensional reduction of 11D supergravity by making the size of seven of the dimensions go to zero It has eight supersymmetries, which is the most any gravitational theory can have, since there are eight halfsteps between spin 2 and spin 2 The spin 2 graviton is the particle with the highest spin in this theory More supersymmetries would mean the particles would have superpartners with spins higher than 2 The only theories with spins higher than 2 which are consistent involve an infinite number of particles such as String Theory and HigherSpin Theories Stephen Hawking in his Brief History of Time speculated that this theory could be the Theory of Everything However, in later years this was abandoned in favour of String Theory There has been renewed interest in the 21st century, with the possibility that this theory may be finite
Contents
 1 Calculations
 2 Particle content
 3 Connection with superstring theory
 4 Extensions
 5 Global symmetries
 6 References
Calculations
It has been found recently that the expansion of N=8 Supergravity in terms of Feynman diagrams has shown that N=8 Supergravity is in some ways[which] a product of two N = 4 super Yang–Mills theories This is written schematically as:
N = 8 Supergravity = N = 4 Super Yang–Mills × N = 4 Super Yang–Mills
This is not surprising, as N=8 supergravity contains six independent representations of N=4 Super Yang–Mills
Particle content
The theory contains 1 graviton spin 2, 8 gravitinos spin 3/2, 28 vector bosons spin 1, 56 fermions spin 1/2, 70 scalar fields spin 0 where we don't distinguish particles with negative spin These numbers are simple combinatorial numbers that come from Pascal's Triangle
One reason why the theory was abandoned was that the 28 vector bosons which form an O8 gauge group is too small to contain the standard model U1xSU2xSU3 gauge group, which can only fit within the orthogonal group O10
For model building, it has been assumed that almost all the supersymmetries would be broken in nature,[why] leaving just one supersymmetry N=1, although nowadays because of the lack of evidence for N=1 supersymmetry higher supersymmetries are now being considered such as N=2
Connection with superstring theory
N=8 Supergravity can be viewed as the low energy approximation of 11D MTheory with seven of its dimensions on a certain[which] compact surface
Extensions
When derived from Heterotic Superstring Theory compactified on higherdimensional tori, there are two extensions to N=8 Supergravity They are the coupling of additional fields which form E8xE8 N=4 SuperYang Mills and SO32 N=4 Super Yang–Mills When adding those fields the number of particles increases to 256 + 496x16 = 8192 = 213 particles
Global symmetries
Some surprising global symmetries have been found in this theory For example, it has been shown that there is an E₇ global symmetry but in order for the theory to be finite it is thought that there may be other symmetries not yet found
References
n=8 super gravity
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N=8 Supergravity
N=8 Supergravity
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