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arXiv 1812.05487hep-ph
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轴子电动力学:量子场计算

Axion-electrodynamics: a quantum field calculation

Marc Beutter, Andreas Pargner, Thomas Schwetz, Elisa Todarello

摘要:

轴子背景场在外部静磁场中感应出微小的振荡电场和磁场。这个特征被用来寻找轴子暗物质。我们使用标准的量子场论技术得到一个表达式的过渡振幅,从中我们确定的经典电磁场诱导的背景轴子场。我们确认以前的结果,如果所施加的静磁场的空间尺寸$R$是小的轴子康普顿波长$λ$相比,感应电场和磁场的参数抑制由小的数字$(R/λ)^2$和$R/λ$,分别相对于当$R$大于$λ$的情况。我们的方法允许一个直观的解释4-动量守恒和动量交换通过光子传播。

英文摘要:

An axion background field induces tiny oscillating electric and magnetic fields in an external static magnetic field. This signature is used to search for axion dark matter. We use standard quantum field theory techniques to obtain an expression for a transition amplitude, from which we identify the classical electromagnetic fields induced by the background axion field. We confirm previous results, that if the spatial size $R$ of the applied static magnetic field is small compared to the axion Compton wavelength $λ$, the induced electric and magnetic fields are parametrically suppressed by the small numbers $(R/λ)^2$ and $R/λ$, respectively, relative to the case when $R$ is larger than $λ$. Our approach allows an intuitive interpretation in terms of 4-momentum conservation and momentum exchange via the photon propagator.

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