Axion-Dilaton Destabilization and the Hubble Tension

Abstract

The discrepancy in measurements of the Hubble constant indicates new physics in dark energy, dark matter, or both. Drawing inspiration from string theory, where axions interact with the other moduli fields, including the dilaton, here we demonstrate that the dynamics of an interacting dilaton and axion naturally realizes the proposal of Early Dark Energy. In this setup, stabilization of the the dilaton is in part due to the axion, and in the early universe the dilaton contributes to dark energy. The combined axion-dilaton system is destabilized when the Hubble constant falls below the mass of the axion, triggering a phase of fast-roll evolution of the dilaton wherein its equation of state is $w=1$, and the early dark energy redshifts away as $a^{-6}$.

v1: 4 pages, 2 figures. v2: references added. v3: more references added, plots updated to show evolution as a function of redshift. v4: Additional references and clarifications added. v5: matches published version. v6: comment added regarding perturbations and effective fluid approximation

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