PreprintarXiv licencearXiv
Axion Pyramid
Abstract
A pronounced pyramid-shaped enhancement in the axion density power spectrum induced by the QCD phase transition is identified. The enhancement occurs near the horizon scale at the transition, with a characteristic comoving length scale comparable to the size of the Solar System, and amplifies the axion density perturbation by factors exceeding 3.5 × 1013 relative to the CDM case. Under the hilltop initial condition, coupling to radiation triggers this enhancement. The initial condition is related to the axion mass, suggesting that observation of the axion pyramid in cosmology may constrain the QCD axion mass.
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BibTeX
@misc{park2026axion,
title = {{Axion Pyramid}},
author = {Chan-Gyung Park and Dahee Lee and Hyerim Noh and Jai-chan Hwang},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.08079},
eprint = {2610.08079},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.08079},
}
RIS
TY - UNPB
TI - Axion Pyramid
AU - Chan-Gyung Park
AU - Dahee Lee
AU - Hyerim Noh
AU - Jai-chan Hwang
PY - 2026
DA - 2026/10/06
PB - arXiv
DO - 10.48550/arxiv.2610.08079
UR - https://arxiv.org/abs/2610.08079
AB - A pronounced pyramid-shaped enhancement in the axion density power spectrum induced by the QCD phase transition is identified. The enhancement occurs near the horizon scale at the transition, with a characteristic comoving length scale comparable to the size of the Solar System, and amplifies the axion density perturbation by factors exceeding 3.5 × 10^13 relative to the CDM case. Under the hilltop initial condition, coupling to radiation triggers this enhancement. The initial condition is related to the axion mass, suggesting that observation of the axion pyramid in cosmology may constrain the QCD axion mass.
ER -