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Observations on Arithmetic Invariants and U-Duality Orbits in N =8 Supergravity
Massimo Bianchi, Sergio Ferrara, Renata Kallosh
We establish a relation between time-like, light-like and space-like orbits of the non-compact E{7(7)}(R)symmetry and discrete E{7(7)}(Z) invariants. We discuss the U-duality invar…
Perturbative and Non-perturbative N =8 Supergravity
Massimo Bianchi, Sergio Ferrara, Renata Kallosh
We study extremal black holes, their ADM mass and area of the horizon in N = 8 supergravity. Contrary to intuition gained from N = 2, 4 theories, in N = 8 supergravity BPS states m…
On UV Finiteness of the Four Loop N=8 Supergravity
Renata Kallosh
The 4-loop 4-point amplitude in N=8 d=4 supergravity is UV finite due to supersymmetry. Even better UV behavior of the 4-loop 4-point amplitude, analogous to that of N=4 SYM theory…
N=8 Supergravity on the Light Cone
Renata Kallosh
We construct the generating functional for the light-cone superfield amplitudes in a chiral momentum superspace. It generates the n-point particle amplitudes which on shell are equ…