English

Asymptotically free scalar curvature-ghost coupling in Quantum Einstein Gravity

High Energy Physics - Theory 2009-11-10 v1 General Relativity and Quantum Cosmology High Energy Physics - Phenomenology

Abstract

We consider the asymptotic-safety scenario for quantum gravity which constructs a non-perturbatively renormalisable quantum gravity theory with the help of the functional renormalisation group. We verify the existence of a non-Gaussian fixed point and include a running curvature-ghost coupling as a first step towards the flow of the ghost sector of the theory. We find that the scalar curvature-ghost coupling is asymptotically free and RG relevant in the ultraviolet. Most importantly, the property of asymptotic safety discovered so far within the Einstein-Hilbert truncation and beyond remains stable under the inclusion of the ghost flow.

Keywords

Cite

@article{arxiv.0907.1828,
  title  = {Asymptotically free scalar curvature-ghost coupling in Quantum Einstein Gravity},
  author = {Astrid Eichhorn and Holger Gies and Michael M. Scherer},
  journal= {arXiv preprint arXiv:0907.1828},
  year   = {2009}
}

Comments

8 pages, 3 figures, RevTeX

R2 v1 2026-06-21T13:23:38.289Z