Natural Theories of Ultra-Low Mass PNGB's: Axions and Quintessence
Christopher T. Hill, Adam K. Leibovich
Abstract
We consider the Wilson Line PNGB which arises in a U(1)N gauge theory, abstracted from a latticized, periodically compactified extra dimension U(1). Planck scale breaking of the PNGB's global symmetry is suppressed, providing natural candidates for the axion and quintessence. We construct an explicit model in which the axion may be viewed as the 5th component of the U(1)Y gauge field in a 1+4 latticized periodically compactified extra dimension. We also construct a quintessence PNGB model where the ultra-low mass arises from Planck-scale suppressed physics itself.
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