Altered axion abundance from a dynamical Peccei-Quinn scale

被引：12

作者：

Allali, Itamar J. ^{[1
]}

Hertzberg, Mark P. ^{[1
]}

Lyu, Yi ^{[2
]}

机构：

[1] Tufts Univ, Inst Cosmol, Dept Phys & Astron, Medford, MA 02155 USA

[2] Univ Calif Santa Cruz, Santa Cruz, CA 95064 USA

来源：

PHYSICAL REVIEW D | 2022年 / 105卷 / 12期

基金：

美国国家科学基金会;

关键词：

INVARIANCE;

D O I：

10.1103/PhysRevD.105.123517

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We build a model in which the relic abundance of axions is altered from the standard misalignment mechanism, either increased or decreased, due to the presence of a new light scalar that couples to the radial part of the Peccei-Quinn (PQ) field. The light scalar makes the effective PQ symmetry-breaking scale dynamical, altering the early-time dynamics for the axion and affecting its late-time dark matter abundance. We analyze this new mechanism semianalytically and numerically, showing that we can accommodate both lighter or heavier axion dark matter, compared to the standard treatments. We discuss implications of the model for axion searches and fundamental physics.

引用

页数：12

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