Asymptotically free scalar curvature-ghost coupling in Quantum Einstein Gravity

Details Asymptotically free scalar curvature-ghost coupling in Quantum Einstein Gravity Asymptotically free scalar curvature-ghost coupling in Quantum Einstein Gravity

2009-07-10

arxiv.org/abs/0907.1828v1

Phys.Rev.D80:104003,2009

Physics

High Energy Physics

High Energy Physics - Theory

8 pages, 3 figures, RevTeX

Scientific paper

10.1103/PhysRevD.80.104003

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.

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