Reconstructing the graviton
We reconstruct the Lorentzian graviton propagator in asymptotically safe quantum gravity from Euclidean data. The reconstruction is applied to both the dynamical fluctuation graviton and the background graviton propagator. We prove that the spectral function of the latter necessarily has negative...
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| Format: | Article |
| Language: | English |
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SciPost
2022-01-01
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| Series: | SciPost Physics |
| Online Access: | https://scipost.org/SciPostPhys.12.1.001 |
| _version_ | 1819001450117726208 |
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| author | Alfio Bonanno, Tobias Denz, Jan M. Pawlowski, Manuel Reichert |
| author_facet | Alfio Bonanno, Tobias Denz, Jan M. Pawlowski, Manuel Reichert |
| author_sort | Alfio Bonanno, Tobias Denz, Jan M. Pawlowski, Manuel Reichert |
| collection | DOAJ |
| description | We reconstruct the Lorentzian graviton propagator in asymptotically safe
quantum gravity from Euclidean data. The reconstruction is applied to both the
dynamical fluctuation graviton and the background graviton propagator. We prove
that the spectral function of the latter necessarily has negative parts similar
to, and for the same reasons, as the gluon spectral function. In turn, the
spectral function of the dynamical graviton is positive. We argue that the
latter enters cross sections and other observables in asymptotically safe
quantum gravity. Hence, its positivity may hint at the unitarity of
asymptotically safe quantum gravity. |
| first_indexed | 2024-12-20T22:49:24Z |
| format | Article |
| id | doaj.art-58d9e0398edf4ad29aeda1d5f115c450 |
| institution | Directory Open Access Journal |
| issn | 2542-4653 |
| language | English |
| last_indexed | 2024-12-20T22:49:24Z |
| publishDate | 2022-01-01 |
| publisher | SciPost |
| record_format | Article |
| series | SciPost Physics |
| spelling | doaj.art-58d9e0398edf4ad29aeda1d5f115c4502022-12-21T19:24:17ZengSciPostSciPost Physics2542-46532022-01-0112100110.21468/SciPostPhys.12.1.001Reconstructing the gravitonAlfio Bonanno, Tobias Denz, Jan M. Pawlowski, Manuel ReichertWe reconstruct the Lorentzian graviton propagator in asymptotically safe quantum gravity from Euclidean data. The reconstruction is applied to both the dynamical fluctuation graviton and the background graviton propagator. We prove that the spectral function of the latter necessarily has negative parts similar to, and for the same reasons, as the gluon spectral function. In turn, the spectral function of the dynamical graviton is positive. We argue that the latter enters cross sections and other observables in asymptotically safe quantum gravity. Hence, its positivity may hint at the unitarity of asymptotically safe quantum gravity.https://scipost.org/SciPostPhys.12.1.001 |
| spellingShingle | Alfio Bonanno, Tobias Denz, Jan M. Pawlowski, Manuel Reichert Reconstructing the graviton SciPost Physics |
| title | Reconstructing the graviton |
| title_full | Reconstructing the graviton |
| title_fullStr | Reconstructing the graviton |
| title_full_unstemmed | Reconstructing the graviton |
| title_short | Reconstructing the graviton |
| title_sort | reconstructing the graviton |
| url | https://scipost.org/SciPostPhys.12.1.001 |
| work_keys_str_mv | AT alfiobonannotobiasdenzjanmpawlowskimanuelreichert reconstructingthegraviton |