9 Acknowledgments

The author thanks Abilio De Freitas, Aaron Grant, David Dunbar, David Kosower, Maxim Perelstein, Joel Rozowsky, Henry Wong, and especially Lance Dixon for collaboration on work described here and for sharing their insight into quantum gravity. The author also thanks Eduardo Guendelman for a number of interesting discussions on the Einstein–Hilbert action and its relation to gauge theory. This work was supported by the U.S. Department of Energy under grant DE-FG03-91ER40662.

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