For those interested in the physics of time and the idea of whether time exists or not, you may find Julian Barbour's work more introductory, accessible and les

For those interested in the physics of time and the idea of whether time exists or not, you may find Julian Barbour's work more introductory, accessible and less esoteric. For example: https://www.youtube.com/watch?v=KkjXuS_Z1ds https://www.youtube.com/watch?v=KkjXuS_Z1ds The Wheeler-DeWitt equation is covered at about 40 minutes in, here.