Asymptotic safety, string theory and the weak gravity conjecture

Senarath de Alwis, Astrid Eichhorn*, Aaron Held, Jan M. Pawlowski, Marc Schiffer, Fleur Versteegen

*Corresponding author for this work

Research output: Contribution to journalJournal article

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We propose a scenario with string theory in the deep ultraviolet, an intermediate asymptotically safe scaling regime for gravity and matter, and the Standard Model in the infrared. This could provide a new perspective to tackle challenges of the two models: For instance, the gravitational Renormalization Group flow could connect a negative microscopic to a positive macroscopic cosmological constant, potentially rendering string theory on an anti-de Sitter background observationally viable. Further, the unitarity of a string-theoretic ultraviolet completion could be inherited by an asymptotically safe fixed point, despite the presence of higher-order interactions. We discuss necessary conditions on the scale of asymptotic safety and the string scale for our scenario to be viable. As a first test, we explore the weak-gravity conjecture in the context of asymptotically safe gravity.

Original languageEnglish
Article number134991
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Number of pages8
Publication statusPublished - 10. Nov 2019

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