- #1
Gerinski
- 323
- 15
Layman question here, kindly provide layman-understandable answers. The problem of quantum gravity is often expressed as saying 'GR predicts a collapse into a genuine singularity, there is no known mechanism which would stop such a collapse', and 'QM has nothing to say about gravity, it can not answer what happens close to the hypothetical singularities'.
But we have reasonable hints that the Planck scale imposes some limits to length and time dimensional extension. My question then is, why is it not considered as just a postulate, an assumption, that the energy density reaches a limit at the Planck-size volume, and it can not get any more dense than that?
What sort of physics would it represent assuming such a postulate, and why are they rejected as an actual possibility? Why are we discarding this option and keep searching for some other quantum gravity options?
Would taking the Planck-scale limit as a given postulate help in any way in reconciling GR and QM, and if not, why so?
Thanks
But we have reasonable hints that the Planck scale imposes some limits to length and time dimensional extension. My question then is, why is it not considered as just a postulate, an assumption, that the energy density reaches a limit at the Planck-size volume, and it can not get any more dense than that?
What sort of physics would it represent assuming such a postulate, and why are they rejected as an actual possibility? Why are we discarding this option and keep searching for some other quantum gravity options?
Would taking the Planck-scale limit as a given postulate help in any way in reconciling GR and QM, and if not, why so?
Thanks