Axion braneworld cosmology
Cosimo Bambi, Masahiro Kawasaki, Federico R. Urban
TL;DR
This paper explores axion cosmology within a five-dimensional brane universe, analyzing how extra dimensions influence axion properties and constraining key parameters through observational comparisons.
Contribution
It introduces a framework for studying axion cosmology in 5D models, providing constraints on decay constants and Planck mass relevant for model building.
Findings
Constraints on 5D axion decay constant from observations
Limits on 5D Planck mass in brane cosmology
Framework applicable to other bulk fields in brane worlds
Abstract
We study axion cosmology in a 5D Universe, in the case of flat and warped extra dimension. The comparison between theoretical predictions and observations constrains the 5D axion decay constant and the 5D Planck mass, which has to be taken into account in building 5D axion models. The framework developed in this paper can be readily applied to other bulk fields in brane universes.
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