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seen Jul 12 at 23:26

Mar
19
answered What can be the smallest chaotic system?
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.
Jan
27
answered What does the graviton-matter Feynman scattering diagram look like?
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.
Jan
23
answered What actually happens to a light ray on a Schwarzschild black hole horizon?
Jan
23
answered Divergence in Supergravity
Jan
23
awarded  Informed
Jan
23
awarded  Supporter
Jan
22
awarded  Editor
Jan
22
revised Show that $\partial_\nu T^{\mu\nu} = - j_\nu F^{\mu\nu}$
added 205 characters in body
Jan
21
awarded  Teacher
Jan
21
answered Show that $\partial_\nu T^{\mu\nu} = - j_\nu F^{\mu\nu}$