I have listed some requirements for a complete theory of quantum gravity. Anything anyone would like to add, subtract, or illuminate would be welcome.(adsbygoogle = window.adsbygoogle || []).push({});

1. A gauge group large enough to contain all known interactions, and all interactions predicted by the theory.

2. An action that generates and describes the motions of all particles and fields included in the theory.

3. The theory must recover quantum mechanics at small distances and slow speeds.

4. The theory must recover general relativity at high speeds and macroscopic distances.

5. The theory must recover newtonian mechanics at low speeds and large distances. This is already implied by 3 and 4.

6. The Lagrangian must spontaneously break the large gauge group into the subgroups that exist in current partial theories.

7. The theory must predict all known particles.

8. The theory must not predict particles that cannot exist, or are not known to exist at the energies available to current accelerators.

9. The theory must be background independent.

10. The theory must be able to solve symbolically what can now only be solved perturbatively.

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# Requirements for a theory of Quantum Gravity, or Theory of Everything

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