A warped relaxion

Understand

We construct a UV completion of the relaxion in a warped extra dimension.

• We identify the relaxion with the zero mode of the fifth component of a bulk gauge field and show how hierarchically different decay constants for this field can be achieved by different localizations of anomalous terms in the warped space.
• This framework may also find applications for other axion-like fields.
• The cutoff of the relaxion model is identified as the scale of the IR brane where the Higgs lives, which can be as high as $10^6$ GeV, while above this scale warping takes over in protecting the Higgs mass.