Axion mass estimates from resonant Josephson junctions

被引：28

作者：

Beck, Christian ^{[1
]}

机构：

[1] Queen Mary Univ London, Sch Math Sci, London E1 4NS, England

来源：

PHYSICS OF THE DARK UNIVERSE | 2015年 / 7-8卷

基金：

英国工程与自然科学研究理事会;

关键词：

Dark matter direct detection; Josephson junctions; Axions; Shapiro step; S/N/S junction; PHYSICS;

D O I：

10.1016/j.dark.2015.03.002

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Recently it has been proposed that dark matter axions from the galactic halo can produce a small Shapiro step-like signal in Josephson junctions whose Josephson frequency resonates with the axion mass (Beck, 2013). Here we show that the axion field equations in a voltage-driven Josephson junction environment allow for a nontrivial solution where the axion-induced electrical current manifests itself as an oscillating supercurrent. The linear change of phase associated with this nontrivial solution implies the formal existence of a large magnetic field in a tiny surface area of the weak link region of the junction which makes incoming axions decay into microwave photons. We derive a condition for the design of Josephson junction experiments so that they can act as optimum axion detectors. Four independent recent experiments are discussed in this context. The observed Shapiro step anomalies of consistently point towards an axion mass of (110 +/- 2) mu eV. This mass value is compatible with the recent BICEP2 results and implies that Peccei-Quinn symmetry breaking was taking place after inflation. (C) 2015 The Author. Published by Elsevier B.V.

引用

页码：6 / 11

页数：6

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