Publication : t11/189
An R^4 non-renormalisation theorem in N=4 supergravity
Tourkine P. (CEA, IPhT (Institut de Physique Théorique), F-91191 Gif-sur-Yvette, France)Vanhove P. (CEA, IPhT (Institut de Physique Théorique), F-91191 Gif-sur-Yvette, France)
Abstract:Année de publication : 2012
We consider the four-graviton amplitudes in CHL constructions providing four-dimensional N=4 models with various numbers of vector multiplets. We show that in these models the two-loop amplitude has a prefactor of d^2R^4. This implies a non-renormalisation theorem for the R^4 term, which forbids the appearance of a three-loop ultraviolet divergence in four dimensions in the four-graviton amplitude. We connect the special nature of the R^4 term to the U(1) anomaly of pure N=4 supergravity.
Revue : Class. Quantum Grav. 29 115006 (2012)
DOI : 10.1088/0264-9381/29/11/115006
Preprint : arXiv:1202.3692
Lien : http://iopscience.iop.org/0264-9381/29/11/115006/
Langue : Anglais
Fichier(s) à télécharger :
publi.pdf
