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- W2055528073 abstract "We identify a simple physical mechanism which is at the heart of Asymptotic Safety in Quantum Einstein Gravity (QEG) according to all available effective average action-based investigations. Upon linearization the gravitational field equations give rise to an inverse propagator for metric fluctuations comprising two pieces: a covariant Laplacian and a curvature dependent potential term. By analogy with elementary magnetic systems they lead to, respectively, dia- and paramagnetic-type interactions of the metric fluctuations with the background gravitational field. We show that above 3 spacetime dimensions the gravitational antiscreening occurring in QEG is entirely due to a strong dominance of the ultralocal paramagnetic interactions over the diamagnetic ones that favor screening. (Below 3 dimensions both the dia- and paramagnetic effects support antiscreening.) The spacetimes of QEG are interpreted as a polarizable medium with a “paramagnetic” response to external perturbations, and similarities with the vacuum state of Yang-Mills theory are pointed out. As a by-product, we resolve a longstanding puzzle concerning the beta function of Newton’s constant in 2 + ϵ dimensional gravity." @default.
- W2055528073 created "2016-06-24" @default.
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- W2055528073 date "2013-01-01" @default.
- W2055528073 modified "2023-10-01" @default.
- W2055528073 title "On the physical mechanism underlying asymptotic safety" @default.
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- W2055528073 doi "https://doi.org/10.1007/jhep01(2013)062" @default.
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