SciPost Submission Page
Safe essential scalar-tensor theories
by Benjamin Knorr
Submission summary
| Authors (as registered SciPost users): | Benjamin Knorr |
| Submission information | |
|---|---|
| Preprint Link: | https://arxiv.org/abs/2204.08564v2 (pdf) |
| Data repository: | https://doi.org/10.17632/9v7ftgswc5.1 |
| Date submitted: | 2023-10-20 11:12 |
| Submitted by: | Knorr, Benjamin |
| Submitted to: | SciPost Physics |
| Ontological classification | |
|---|---|
| Academic field: | Physics |
| Specialties: |
|
| Approach: | Theoretical |
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.
Current status:
In refereeing