EFT & Species Scale: Friends or foes?
Bruno Valeixo Bento, Jo\~ao F. Melo

TL;DR
This paper provides a detailed perturbative derivation of the species scale in quantum gravity, clarifying how infinite towers of states can be incorporated within effective field theories without inconsistency.
Contribution
It offers a novel perturbative calculation of the species scale considering infinite towers of states, resolving confusion about their role in EFTs and quantum gravity.
Findings
Derived the species scale from 1-loop graviton propagator calculations.
Showed how infinite towers of states contribute to the species scale.
Demonstrated compatibility of counting only light fields with infinite towers in EFTs.
Abstract
Recently the notion that quantum gravity effects could manifest at scales much lower than the Planck scale has seen an intense Swamplandish revival. Dozens of works have explored how the so-called species scale -- at which an effective description of gravity must break down -- relates to String Theory and the Swampland conjectures. In particular, the interplay between this scale and the abundant towers of states becoming lighter in asymptotic regions of moduli spaces has proved to be key in understanding the real scale of quantum gravity. Nevertheless concerns have been raised regarding the validity of using infinite towers of states when estimating this scale within Effective Field Theory and, more precisely, the consistency of cutting the tower part way through in a framework that relies on a clear separation of scales. In this work we take an EFT point-of-view and provide a detailed…
Peer Reviews
No public reviews on file for this paper yet. If you reviewed it on a platform where reviews are public (OpenReview, ICLR, NeurIPS, ICML), you can paste yours below so the community can read it here.
Videos
No videos yet. Explain this paper in a talk, walkthrough, or lecture? Add one.
