Progress on Ultraviolet Finiteness of Supergravity
High Energy Physics - Theory
2009-03-02 v2 General Relativity and Quantum Cosmology
High Energy Physics - Phenomenology
Abstract
In this lecture we summarize recent calculations pointing to the possible ultraviolet finiteness of N = 8 supergravity in four dimensions. We outline the modern unitarity method, which enables multiloop calculations in this theory and allows us to exploit a remarkable relation between tree-level gravity and gauge-theory amplitudes. We also describe a link between observed cancellations at loop level and improved behavior of tree-level amplitudes under large complex deformations of momenta.
Cite
@article{arxiv.0902.3765,
title = {Progress on Ultraviolet Finiteness of Supergravity},
author = {Z. Bern and J. J. M. Carrasco and H. Johansson},
journal= {arXiv preprint arXiv:0902.3765},
year = {2009}
}
Comments
Invited lecture at International School of Subnuclear Physics, 46th Course, Erice Sicily, August 29-September 7, 2008. 20 pages, 8 figures, LaTeX, v2 references corrected