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.
due to the combination of ad- ditional bulk fields and more involved com- pactifications
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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.