带有小衰变常数的 QCD 轴子暗物质。

QCD Axion Dark Matter with a Small Decay Constant.

机构信息

Leinweber Center for Theoretical Physics, University of Michigan, Ann Arbor, Michigan 48109, USA.

Department of Physics, University of California, Berkeley, California 94720, USA.

出版信息

Phys Rev Lett. 2018 May 25;120(21):211602. doi: 10.1103/PhysRevLett.120.211602.

DOI:10.1103/PhysRevLett.120.211602

PMID:29883137

Abstract

The QCD axion is a good dark matter candidate. The observed dark matter abundance can arise from misalignment or defect mechanisms, which generically require an axion decay constant f_{a}∼O(10^{11}) GeV (or higher). We introduce a new cosmological origin for axion dark matter, parametric resonance from oscillations of the Peccei-Quinn symmetry breaking field, that requires f_{a}∼(10^{8}-10^{11}) GeV. The axions may be warm enough to give deviations from cold dark matter in large scale structure.

摘要

轴子是暗物质的一个很好的候选者。观测到的暗物质丰度可能来自失谐或缺陷机制，这些机制通常需要轴子衰变常数 f_{a}∼O(10^{11}) GeV（或更高）。我们引入了轴子暗物质的一个新的宇宙学起源，即 Peccei-Quinn 对称性破缺场的振荡的参数共振，这需要 f_{a}∼(10^{8}-10^{11}) GeV。这些轴子可能足够热，以至于在大尺度结构中偏离冷暗物质。