Perturbative gravity from QCD amplitudes

We demonstrate that QCD gluon amplitudes can be used to construct a Lagrang ian for gravity. This procedure makes use of perturbative 'squaring' relati ons between gravity and gauge theory that follow from string theory. We exp licitly carry out the construction for up to five-point interactions and di scuss a set of field variables in the Einstein-Hilbert Lagrangian for inter preting the Lagrangian obtained from QCD. A spin-off from our analysis is t hat it can be used to provide simpler tree-level gravity Feynman rules than for conventional gauges. (C) 1999 Published by Elsevier Science B.V. All r ights reserved.