Abstract
It is noted that not only time but also the imaginary unit is absent from the Wheeler-DeWitt equation (WDE), the basic equation of canonical quantum gravity. This leads to a severe problem in an attempt to recover the time-dependent Schrödinger equation from the WDE. It is suggested that the problem will be solved if the WDE is actually complex and not real, as in most models hitherto considered.
- Received 10 March 1993
DOI:https://doi.org/10.1103/PhysRevD.47.5422
©1993 American Physical Society