arXiv:astro-ph/9910325v23 4 Jul 2006 Gravitation Without Curved Space-time Kris Krogh Neuroscience Research Institute University of California, Santa Barbara, CA 93106, USA email: k krogh@lifesci.ucsb.edu July 2, 2006 Abstract A quantum-mechanical theory of gravitation is presented, where the motion of particles is based on the optics of de Broglie waves. Here the large-scale geometry of the universe is inherently flat, and its age is not constrained to < 13 Gyr. While this theory agrees with the standard experimental tests of Einstein’s general relativity, it predicts a differ- ent second-order deflection of light, and measurement of the Lense- Thirring effect in the upcoming NASA experiment Gravity Probe B. 1