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arXiv 1804.01992hep-phastro-ph.HE
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磁星硬X射线发射对类轴粒子的约束

Constraining Axion-Like-Particles with Hard X-ray Emission from Magnetars

Jean-François Fortin, Kuver Sinha

摘要:

磁星核心产生的类轴子粒子(ALP)会在磁层中转化为光子,导致硬X射线波段的可能特征。我们进行了详细的计算ALP光子转换概率在磁层,重铸耦合微分方程,描述ALP光子传播成一种形式,是有效的大规模数值扫描。我们显示的ALP能量,质量,ALP-光子耦合,磁星半径,表面磁场,和之间的角度的磁场和传播方向的转换概率的依赖关系。一路上,我们开发了一个分析的形式主义,在更一般的$n$状态振荡系统进行类似的计算。假设ALP发射率从核心,只是次主导中微子发射,我们计算的ALP质量与ALP光子耦合空间的约束,以SGR 1806-20为例。特别是,我们采取基准值的磁星半径和核心温度,并约束ALP参数空间的要求,ALP-光子转换的光度不应超过总的观测光度的磁星。由此产生的约束条件是竞争力的ALP参数空间的相关部分从日光镜实验的约束。

英文摘要:

Axion-like particles (ALPs) produced in the core of a magnetar will convert to photons in the magnetosphere, leading to possible signatures in the hard X-ray band. We perform a detailed calculation of the ALP-to-photon conversion probability in the magnetosphere, recasting the coupled differential equations that describe ALP-photon propagation into a form that is efficient for large scale numerical scans. We show the dependence of the conversion probability on the ALP energy, mass, ALP-photon coupling, magnetar radius, surface magnetic field, and the angle between the magnetic field and direction of propagation. Along the way, we develop an analytic formalism to perform similar calculations in more general $n$-state oscillation systems. Assuming ALP emission rates from the core that are just subdominant to neutrino emission, we calculate the resulting constraints on the ALP mass versus ALP-photon coupling space, taking SGR 1806-20 as an example. In particular, we take benchmark values for the magnetar radius and core temperature, and constrain the ALP parameter space by the requirement that the luminosity from ALP-to-photon conversion should not exceed the total observed luminosity from the magnetar. The resulting constraints are competitive with constraints from helioscope experiments in the relevant part of ALP parameter space.

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