Perturbative Relations Between Gravity and Gauge Theory
The heuristic relation (1) between gravity and gauge theory is a very useful way to think about gravity, at least perturbatively. Unitarity allows one to bootstrap the tree-level (KLT) versions of (1) up to the multi-loop level. Thus gravity calculations can be performed by recycling the simpler Yang-Mills calculations. Although we have discussed primarily the maximally supersymmetric case, where explicit calculations are the simplest, there should be applications to more general cases as well. Indeed, special one-loop helicity amplitudes with arbitrary numbers of external gravitons have been computed in this way, in both N = 8 supergravity and pure gravity [25]. We have learned that supergravity amplitudes are less divergent than previously expected. In D = 4, it is still true that no supergravity divergence has yet been firmly established. Indeed, our expectations in the maximally supersymmetric case, N = 8, are for the first divergence to occur only at five loops, not three loops. Further work in this direction, using the techniques described here, could help to remedy this situation.
- Research Organization:
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (US)
- DOE Contract Number:
- AC03-76SF00515
- OSTI ID:
- 802048
- Report Number(s):
- SLAC-PUB-8303; TRN: US0205634
- Resource Relation:
- Other Information: PBD: 22 Nov 1999
- Country of Publication:
- United States
- Language:
- English
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