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Reconstructing the graviton

by Alfio Bonanno, Tobias Denz, Jan M. Pawlowski, Manuel Reichert

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Submission summary

As Contributors: Manuel Reichert
Arxiv Link: (pdf)
Date accepted: 2021-11-01
Date submitted: 2021-10-07 12:37
Submitted by: Reichert, Manuel
Submitted to: SciPost Physics
Academic field: Physics
  • Gravitation, Cosmology and Astroparticle Physics
  • High-Energy Physics - Theory
Approach: Theoretical


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.

Published as SciPost Phys. 12, 001 (2022)

List of changes

Updated references, corrected typos

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