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arXiv · 2204.08564

Safe essential scalar-tensor theories

Benjamin Knorr
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Abstract

We discuss the renormalisation group flow of all essential couplings of quantum gravity coupled to a shift-symmetric scalar field at fourth order in the derivative expansion. We derive the global structure of the phase diagram, and identify a bounded region in theory space which is both asymptotically safe in the ultraviolet, and connects to standard effective field theory in the infrared. Our system thus satisfies the weak-gravity bound. The allowed infrared behaviour of the essential four-scalar coupling is restricted by requiring an ultraviolet completion. This bound can be saturated by a theory without free parameters, which gives a concrete example for a fully predictive scalar-tensor theory.

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Benjamin Knorr. 2022-04-18. Safe essential scalar-tensor theories. https://arxiv.org/abs/2204.08564

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