2024-03-29T15:36:46Z
https://nagoya.repo.nii.ac.jp/oai
oai:nagoya.repo.nii.ac.jp:00030544
2023-01-16T04:29:12Z
2437:2438:2439
Axionlike Origin of the Primordial Density Perturbation
Kobayashi, Takeshi
101694
We show that an axionlike field coupled to a new confining gauge group can generate the primordial density perturbation in the postinflation 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.
journal article
American Physical Society
2020-07
application/pdf
Physical Review Letters
1
125
011302
0031-9007
https://nagoya.repo.nii.ac.jp/record/30544/files/PhysRevLett_125_011302.pdf
eng
https://doi.org/10.1103/PhysRevLett.125.011302
© 2020 American Physical Society