Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. In theoretical physics, the Wheeler–DeWitt equation is a functional differential equation. It is ill defined in the general case, but very important in theoretical physics, especially in quantum gravity. It is a functional differential equation on the space of three dimensional spatial metrics. The Wheeler-DeWitt equation has the form of an operator acting on a wave functional, the functional reduce to a function in cosmology. Contrary to the general case, the Wheeler–DeWitt equation is well defined in mini-superspaces like the configuration space of cosmological theories. An example of such a wave function is the Hartle-Hawking state. Bryce DeWitt first published this equation in 1967 under the name “Einstein-Schrodinger equation” and was later renamed the “Wheeler-DeWitt equation”.

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