English

Reconstructing the graviton

High Energy Physics - Theory 2022-01-05 v3 General Relativity and Quantum Cosmology High Energy Physics - Phenomenology

Abstract

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.

Keywords

Cite

@article{arxiv.2102.02217,
  title  = {Reconstructing the graviton},
  author = {Alfio Bonanno and Tobias Denz and Jan M. Pawlowski and Manuel Reichert},
  journal= {arXiv preprint arXiv:2102.02217},
  year   = {2022}
}

Comments

22 pages, 8 figures, 2 tables

R2 v1 2026-06-23T22:48:39.730Z