Progress on Ultraviolet Finiteness of Supergravity

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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.
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

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High Energy Physics - Theory, General Relativity and Quantum Cosmology, High Energy Physics - Phenomenology

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http://salesiana.dossiersoluciones.com/handle/123456789/221739

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/0902.3765
 http://arxiv.org/abs/0902.3765

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arXiv