Model of the quintessence axion
arXiv:2303.02852 · doi:10.1103/PhysRevD.108.015028
Abstract
We construct a model of the quintessence axion based on a gauged chiral symmetry and an additional flat fifth dimension. The required high qualities are guaranteed by the brane separation. The observed cosmological constant (i.e., the potential energy of the quintessence axion) is determined by the size of the extra dimension and the axion decay constant is fixed almost at , which is sufficiently large for the stability of the axion field near the hilltop of its potential. Furthermore, the movement of the axion can also easily explain the recently reported isotropic cosmic birefringence of the cosmic microwave background photon.
arXiv comment5 pages, 1 appendix; published on PRD
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