Axionlike Origin of the Primordial Density Perturbation
arXiv:2005.01741 · doi:10.1103/PhysRevLett.125.011302
Abstract
We show that an axionlike field coupled to a new confining gauge group can generate the primordial density perturbation in the post-inflation universe. The axion decay constant and strong coupling scale are uniquely determined by observations of the density perturbation, which further suggest a temporal deconfinement of the gauge group after inflation. The resulting temperature-dependent axion potential, together with its periodic nature, gives rise to the red-tilted density perturbation, with a positive local-type non-Gaussianity of order unity.
arXiv comment7 pages, 1 figure, v2: published in PRL
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