Quantum Gravity: Has Spacetime Quantum Properties?
| dc.creator | Hedrich, Reiner | |
| dc.date | 2009-02-02 | |
| dc.date.accessioned | 2026-07-07T12:36:55Z | |
| dc.date.available | 2026-07-07T12:36:55Z | |
| dc.description | The incompatibility between GR and QM is generally seen as a sufficient motivation for the development of a theory of Quantum Gravity. If - so a typical argumentation - QM gives a universally valid basis for the description of all natural systems, then the gravitational field should have quantum properties. Together with the arguments against semi-classical theories of gravity, this leads to a strategy which takes a quantization of GR as the natural avenue to Quantum Gravity. And a quantization of the gravitational field would in some sense correspond to a quantization of geometry. Spacetime would have quantum properties. But, this strategy will only be successful, if gravity is a fundamental interaction. - What, if gravity is instead an intrinsically classical phenomenon? Then, if QM is nevertheless fundamentally valid, gravity can not be a fundamental interaction. An intrinsically classical gravity in a quantum world would have to be an emergent, induced or residual, macroscopic effect, caused by other interactions. The gravitational field (as well as spacetime) would not have any quantum properties. A quantization of GR would lead to artifacts without any relation to nature. The serious problems of all approaches to Quantum Gravity that start from a direct quantization of GR or try to capture the quantum properties of gravity in form of a 'graviton' dynamics - together with the, meanwhile, rich spectrum of approaches to an emergent gravity and/or spacetime - make this latter option more and more interesting for the development of a theory of Quantum Gravity. The most advanced emergent gravity (and spacetime) scenarios are of an information-theoretical, quantum-computational type. | |
| dc.description | 31 pages | |
| dc.identifier | https://arxiv.org/abs/0902.0190 | |
| dc.identifier | http://arxiv.org/abs/0902.0190 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/218260 | |
| dc.subject | General Relativity and Quantum Cosmology | |
| dc.title | Quantum Gravity: Has Spacetime Quantum Properties? | |
| dc.type | text |