Related Experiment Video
Updated: Jul 14, 2026

Setting Limits on Supersymmetry Using Simplified Models
Published on: November 15, 2013
Cancellations beyond finiteness in N=8 supergravity at three loops
Z Bern1, J J Carrasco, L J Dixon
1Department of Physics and Astronomy, UCLA, Los Angeles, California 90095-1547, USA.
Abstract:
We construct the three-loop four-point amplitude of N=8 supergravity using the unitarity method. The amplitude is ultraviolet finite in four dimensions. Novel cancellations, not predicted by traditional superspace power-counting arguments, render its degree of divergence in D dimensions no worse than that of N=4 super-Yang-Mills theory--a finite theory in four dimensions. Similar cancellations can be identified at all loop orders in certain unitarity cuts, suggesting that N=8 supergravity may be a perturbatively finite theory of quantum gravity.
Related Concept Videos
Conservation of Mass in Finite Cotrol Volume
A system is defined as a collection of unchanging contents, and the conservation of mass states that a system's mass is constant.
Limits at Infinity
Schwarzschild Radius and Event Horizon
The minimum speed required to launch a projectile from the surface of an object to which it is gravitationally bound so that it eventually escapes the object’s gravitational field is called the escape velocity. The escape velocity is independent of the mass of the object. Merging the idea of escape velocity with the...
Indeterminate Products
Divergence and Curl of Electric Field
Divergence and Curl of Magnetic Field

