Talk:Graviton
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Disputed reference
[edit]The published primary ref:
- Tobar, Germain; et al. (22 August 2024). "Detecting single gravitons with quantum sensing". Nat Commun. 15 (1): 7229. arXiv:2308.15440. doi:10.1038/s41467-024-51420-8. PMC 11341900. PMID 39174544.
has been disputed by an expert in an unpublished work:
- Carney, Daniel. "Comments on graviton detection." arXiv preprint arXiv:2408.00094 (2024).
Johnjbarton (talk) 16:10, 19 September 2024 (UTC)
- Thanks for the addition. Now I am thinking would even the Jupiter size detector (if it didn't collapse to a black hole) be able to detect single gravitons, as the source above states that Bell like inequalities need to be violated (or something similar) before you can prove quantization and not just classical fields producing "clicks". IlkkaP (talk) 16:58, 19 September 2024 (UTC)
Graviton upper mass bound
[edit]In the infobox, Particle Data Group source gives graviton mass upper bound as 6×10−32 eV/c2. Planetary trajectories and gravitational wave detections based upper bounds are of the order of 1×10−23 eV/c2. This difference should somehow be explained. As I understand it, the tighter bound is much more model dependent. How to source and explain this in the article? IlkkaP (talk) 17:16, 19 September 2024 (UTC)
Negative mass analogy?
[edit]The rubber sheet image with the red negative mass shows space curving upwards instead of downwards. Is this a correct analogy? It is still stretching, not compressing space as I assume a negative mass would do, right?? Tayste (edits) 21:17, 24 September 2024 (UTC)
- The unsourced image has nothing to do with the article. Johnjbarton (talk) 01:59, 25 September 2024 (UTC)
No theory because...
[edit]The intro says:
- There is no complete quantum field theory of gravitons due to an outstanding mathematical problem with renormalization in general relativity.
However a review like
- Carlip, S. (2001). Quantum gravity: a progress report. Reports on progress in physics, 64(8), 885.
lists many other reasons. Johnjbarton (talk) 17:16, 30 November 2024 (UTC)