Oppenheim, Jonathan;
(2023)
Is it time to rethink quantum gravity?
International Journal of Modern Physics D
, Article 2342024. 10.1142/s0218271823420245.
(In press).
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Abstract
Although it’s widely believed that gravity should have a quantum nature like every other force, the conceptual obstacles to constructing a quantum theory of gravity compel us to explore other perspectives. Gravity is not like any other force. It alone defines a universal spacetime geometry upon which quantum fields evolve. We feel gravity because matter causes spacetime to bend. Time flows at unequal rates at different locations. The rate at which time flows, and the causal structure it provides, may be required to have a classical description in order for quantum theory to be well-formulated. I discuss arguments for this proposition, but ultimately conclude that we must turn to experiment to guide us.
| Type: | Article |
|---|---|
| Title: | Is it time to rethink quantum gravity? |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1142/s0218271823420245 |
| Publisher version: | https://doi.org/10.1142/S0218271823420245 |
| Language: | English |
| Additional information: | This is an Open Access article published by World Scientific Publishing Company. It is distributed under the terms of the Creative Commons Attribution 4.0 (CC BY) License which permits use, distribution and reproduction in any medium, provided the original work is properly cited. |
| Keywords: | Quantum gravity, post-quantum classical gravity, hybrid classical-quantum gravity |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10182503 |
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