THE QUANTUM-THEORY OF GENERAL-RELATIVITY AT LOW ENERGIES

In quantum field theory there is now a well developed technique, effec tive field theory, which allows one to obtain low energy quantum predi ctions in ''non-renormalizable'' theories, using only the degrees of f reedom and interactions appropriate for those energies. Whether or not general relativity is truly fundamental, at low energies it is automa tically described as a quantum effective field theory and this allows a consistent framework for quantum gravity at ordinary energies. I bri efly describe the nature and limits of the technique.