A bulk axion in flat or warped extra dimensions cannot produce displaced 'QCD maxion' patterns; only a canonical QCD axion plus a decoupled KK plateau survives the combined gravitational, unitarity, and astrophysical constraints.
Emergent/Composite axions
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abstract
Hidden theories coupled to the SM may provide emergent axions, that are composites/bound-states of the hidden fields. This is motivated by paradigms emerging from the AdS/CFT correspondence but it is a more general phenomenon. We explore the general setup and find that UV-sourced interactions of instanton densities give rise to emergent axions in the IR. We study the general properties of such axions and argue that they are generically different from both fundamental and composite axions that have been studied so far.
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Extra-dimensional axion patterns
A bulk axion in flat or warped extra dimensions cannot produce displaced 'QCD maxion' patterns; only a canonical QCD axion plus a decoupled KK plateau survives the combined gravitational, unitarity, and astrophysical constraints.