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In theoretical physics, the Wheeler-deWitt equation is an equation that a wave function of the Universe should satisfy in a theory of quantum gravity. An example of such a wave function is the Hartle-Hawking state.
Simply speaking, the WDW equation says
- <math>H |\psi\rangle = 0<math>
where <math>H<math> is the total Hamiltonian constraint in quantized general relativity.
There is also a diffeomorphism constraint.
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