H3O +反转转动谱对m_e/m_p变化的敏感性
Sensitivity of the H3O+ inversion-rotational spectrum to changes in m_e/m_p
摘要：
NH_3中的量子力学隧穿反转跃迁被积极地用作研究电子与质子质量比μ = m_e/m_p可能变化的灵敏工具。H_3O ~+分子的反转势垒明显低于NH_3。因此，它的隧穿跃迁发生在远红外（FIR）区域，并与旋转跃迁混合。在银河系和邻近星系的星际介质中观测到几个这样的远红外和亚毫米波跃迁。我们发现，这些过渡的静止帧频率是非常敏感的变化μ，它们的灵敏度系数有不同的迹象。因此，H3 O+可以被用作一个独立的目标，以测试假设的变化，亩测量在不同的环境条件下的高（陆地）和低（星际介质）的物质密度。提出了一类变色龙型标量场模型中μ和耦合常数的环境依赖性，该模型是暗能量载体的候选者。
英文摘要：
Quantum mechanical tunneling inversion transition in ammonia NH3 is actively used as a sensitive tool to study possible variations of the electron-to-proton mass ratio, mu = m_e/m_p. The molecule H3O+ has the inversion barrier significantly lower than that of NH3. Consequently, its tunneling transition occurs in the far-infrared (FIR) region and mixes with rotational transitions. Several such FIR and submillimiter transitions are observed from the interstellar medium in the Milky Way and in nearby galaxies. We show that the rest-frame frequencies of these transitions are very sensitive to the variation of mu, and that their sensitivity coefficients have different signs. Thus, H3O+ can be used as an independent target to test hypothetical changes in mu measured at different ambient conditions of high (terrestrial) and low (interstellar medium) matter densities. The environmental dependence of mu and coupling constants is suggested in a class of chameleon-type scalar field models - candidates to dark energy carrier.
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