UV completion pathways for torsion and non-metricity inflation

Ascertain ultraviolet completions for torsion-based (f(T), Einstein–Cartan) and non-metricity-based (f(Q)) inflationary theories by establishing consistent embeddings within string theory, supergravity, or asymptotically safe quantum gravity, and delineate the conditions under which these embeddings reproduce viable inflationary phenomenology.

Background

Unlike curvature-based Starobinsky inflation, torsion and non-metricity frameworks lack widely accepted UV completions. The review highlights the importance of connecting these geometric models to fundamental theories to ensure quantum consistency and predictivity.

Clarifying UV embeddings would also address issues such as unitarity, strong coupling, and the validity of effective field theory during inflation.