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hep-ph2025
Cosmology of Gravi-Axions
Stephon Alexander, Gregory Gabadadze, Leah Jenks +2
We show how a mass term for gravitational axions (''gravi-axions'') with a Chern-Simons coupling to gravity can naturally arise due to non-perturbative contributions from Euclidean…
hep-ph2025
Detecting the -axiverse through parametric resonance
Stephon Alexander, Geoff Beck, Santiago Loane +1
Axions are a leading dark matter candidate. In this work, we study the detectability of a multi-axion-like model, dubbed the -axiverse, that is distinguishable from the string a…
hep-ph2024
The Field Theory Axiverse
Stephon Alexander, Tucker Manton, Evan McDonough
Axion and axion-like particles (ALPs) are a prominent candidate for physics beyond the Standard Model, and can play an important role in cosmology, serving as dark matter or dark e…