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arXiv 0708.2646hep-phastro-phgr-qchep-th
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用伽马射线暴的极化瞬发辐射约束轴子

Constraining axion by polarized prompt emission from gamma ray bursts

A. Rubbia, A. S. Sakharov

摘要:

像伽马射线暴(GRB)这样的强磁化天体在足够宽的能带上传播的极化伽玛射线辐射提供了一个检验不可见轴子假设的机会。不同能量的伽马射线的轴诱导二向色性将导致较高能量事件的偏振平面相对于较低能量事件的偏振平面的未对准,导致形成要在检测器中识别的偏振信号的图案所需的统计的损失。根据这一点,任何来自具有扩展磁场的物体的极化伽马射线的证据都可以被解释为对某个参数范围内不可见轴子存在的约束。基于在几个伽玛暴中探测到的极化MeV辐射的报道,我们导出了轴子-光子耦合的约束条件。这种约束$\g_{aγγ}\le 2.2\cdot 10^{-11} {\rm GeV^{-1}}$计算的轴子质量$m_a=10^{-3} {\rm eV}$的竞争力与CAST的灵敏度,并成为更强的质量较低。

英文摘要:

A polarized gamma ray emission spread over a sufficiently wide energy band from a strongly magnetized astrophysical object like gamma ray bursts (GRBs) offers an opportunity to test the hypothesis of invisible axion. The axionic induced dichroism of gamma rays at different energies should cause a misalignment of the polarization plane for higher energy events relative to that one for lower energies events resulting in the loss of statistics needed to form a pattern of the polarization signal to be recognized in a detector. According to this, any evidence of polarized gamma rays coming from an object with extended magnetic field could be interpreted as a constraint on the existence of the invisible axion for a certain parameter range. Based on reports of polarized MeV emission detected in several GRBs we derive a constraint on the axion-photon coupling. This constraint $\g_{aγγ}\le 2.2\cdot 10^{-11} {\rm GeV^{-1}}$ calculated for the axion mass $m_a=10^{-3} {\rm eV}$ is competitive with the sensitivity of CAST and becomes even stronger for lower masses.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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