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High Energy Physics - Theory

arXiv:2111.13232 (hep-th)
[Submitted on 25 Nov 2021 (v1), last revised 27 Feb 2023 (this version, v2)]

Title:Lorentzian quantum gravity and the graviton spectral function

Authors:Jannik Fehre, Daniel F. Litim, Jan M. Pawlowski, Manuel Reichert
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Abstract:We present the first direct and non-perturbative computation of the graviton spectral function in quantum gravity. This is achieved with the help of a novel Lorentzian renormalisation group approach, combined with a spectral representation of correlation functions. We find a positive graviton spectral function, showing a massless one-graviton peak and a multi-graviton continuum with an asymptotically safe scaling for large spectral values. We also study the impact of a cosmological constant. Further steps to investigate scattering processes and unitarity in asymptotically safe quantum gravity are indicated.
Comments: 12 pages, 7 figures, journal-published version
Subjects: High Energy Physics - Theory (hep-th); General Relativity and Quantum Cosmology (gr-qc)
Cite as: arXiv:2111.13232 [hep-th]
  (or arXiv:2111.13232v2 [hep-th] for this version)
  https://doi.org/10.48550/arXiv.2111.13232

Submission history

From: Manuel Reichert [view email]
[v1] Thu, 25 Nov 2021 19:38:17 UTC (1,206 KB)
[v2] Mon, 27 Feb 2023 20:38:41 UTC (1,209 KB)
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