氨的反演光谱对M_p/M_e时变的增强灵敏度
Enhanced sensitivity to time-variation of m_p/m_e in the inversion spectrum of ammonia
摘要：
我们计算了氨的反转谱对质子质量与电子质量之比μ =m_p/m_e随时间变化的灵敏度。对于反转跃迁（λ = 1.25 cm^{-1}），相对频移显著增强：δ（ω）/ω =-4.46，δ（μ）/μ。这种增强允许一个增加的灵敏度，μ使用NH_3光谱的高红移对象的时间变化。我们利用已发表的天体B 0218 +357的微波光谱数据，在红移z=0.6847处设定极限delta（mu）/mu =（0.6 +/- 1.9）10^{-6};这个极限比用不同方法得到的极限好几倍，而且可能会有显著的改进。假设线性时间依赖性，我们得到dot{mu}/mu=（-1 +/-3）10^{-16} yr^{-1}。
英文摘要：
We calculate the sensitivity of the inversion spectrum of ammonia to possible time-variation of the ratio of the proton mass to the electron mass, mu=m_p/m_e. For the inversion transition (lambda= 1.25 cm^{-1}) the relative frequency shift is significantly enhanced: delta(omega)/omega=-4.46, delta(mu)/mu. This enhancement allows one to increase sensitivity to the time-variation of mu using NH_3 spectra for high redshift objects. We use published data on microwave spectra of the object B0218+357 to place the limit delta(mu)/mu =(0.6 +/- 1.9) 10^{-6} at redshift z=0.6847; this limit is several times better than the limits obtained by different methods and may be significantly improved. Assuming linear time dependence we obtain dot{mu}/mu=(-1 +/- 3) 10^{-16} yr^{-1}.
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