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| seen | Mar 31 at 19:41 | |
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Jan 27 |
comment |
What does the graviton-matter Feynman scattering diagram look like? Yes, this diagram will contribute to physical processes. Just a comment: please remember that feynman diagrams are just perturbative calculation tools, this particular one will depend on the arbitrary gauge choise, so it self does not represent the full physical process. |
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Jan 24 |
comment |
Divergence in Supergravity N=8 Sugra is 4 dimensional theory. If you look at possible counter terms that may arise like R^2, R^3 i.e. different contractions of Riemann tensor. Some of them will be not allowed by different symmetries e.g. susy. The statement would be that on dimensional grounds counter terms at 7 loops in D=4 N=8 SUGRA, 5 loops in Maximally Supersymmetric SUGRA in 5 dimensions, will be allowed by the same symmetries. Therefore, if you find that one of them in absent, then there must be some new/unknown symmetry that kills it, which should also kill the other. |
