# Prima Facie Questions in Quantum Gravity

@inproceedings{CJIsham1993PrimaFQ, title={Prima Facie Questions in Quantum Gravity}, author={C.J.Isham}, year={1993} }

The long history ofthe study ofquantum gravity has thrown up a com plex web ofideasand approaches.Theaim ofthisarticleisto unravelthisweb a little by analysing som e ofthe prim a facie questionsthatcan be asked ofalm ost any approach to quantum gravity and whoseanswersassistin classifying thedi erent schem es. Particular em phasisis placed on (i)the role ofbackground conceptual and technicalstructure;(ii) the role ofspacetim e di eom orphism s;and (iii) the problem oftim e.

## 64 Citations

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## References

SHOWING 1-7 OF 7 REFERENCES

### Quantum gravity: an introduction to some recent results

- Physics
- 1989

This article presents a general overview of the problems involved in the application of the quantum principle to a theory of gravitation. The ultraviolet divergences that appear in any perturbative…

### Generally covariant quantum field theory and scaling limits

- Physics
- 1987

The formulation of a generally covariant quantum field theory is described. It demands the elimination of global features and a characterization of the theory in terms of the allowed germs of…

### C onceptualand geom etri calprobl em si n quantum gravi ty

- Berl i n
- 1992

### T i m e and the i nterpretati on ofquantum gravi ty

- Phys. Rev.D
- 1989

### Integrabl e System s, Q uantum G roups, and Q uantum Fi el d T heori es' , K l uwer A cadem i c Publ i shers

- C anoni calquantum gravi ty and the probl em ofti m e
- 1993

### T i m e and i nterpretati ons ofquantum gravi ty,in ' Proceedi ngs of the 4th C anadi an C onference on G eneralR el ati vi ty and R el ati vi sti c A strophysi cs

- W orl d Sci enti c
- 1992

### Lectureson N on-Perturbati veC anoni calG ravi ty

- 1991