高精度的氢分子莱曼和维纳谱带实验室测量以及对质子与电子质量比宇宙学变化的改进限制。

Highly accurate H2 Lyman and Werner band laboratory measurements and an improved constraint on a cosmological variation of the proton-to-electron mass ratio.

作者信息

Ubachs W, Reinhold E

机构信息

Laser Centre, Department of Physics and Astronomy, Vrije Universiteit, De Boelelaan 1081, 1081 HV Amsterdam, The Netherlands.

出版信息

Phys Rev Lett. 2004 Mar 12;92(10):101302. doi: 10.1103/PhysRevLett.92.101302.

DOI:10.1103/PhysRevLett.92.101302

PMID:15089190

Abstract

Transition wavelengths on a large set of H2 Lyman and Werner band spectral lines have been obtained at an accuracy of 5 x 10(-8), using a narrow band tunable extreme ultraviolet laser. The data are used to determine a constraint on a possible cosmological variation of the proton-to-electron mass ratio (mu=Mp/me) from a comparison with highly redshifted spectral data of quasistellar objects, yielding a fractional change in the mass ratio of Deltamu/mu=-0.5+/-3.6 x 10(-5) (2sigma), which would correspond to a temporal change of d/dt(Deltamu/mu)=-0.4+/-3.0 x 10(-15) per year (2sigma) if a linear cosmological expansion model is assumed.

摘要

使用窄带可调谐极紫外激光，已获得大量H2莱曼和维纳带光谱线的跃迁波长，精度达到5×10⁻⁸。通过与类星体的高红移光谱数据进行比较，这些数据被用于确定质子与电子质量比（μ = Mp/me）可能的宇宙学变化的约束条件，得出质量比的分数变化为Δμ/μ = -0.5 ± 3.6×10⁻⁵（2σ），如果假设线性宇宙学膨胀模型，这将对应于每年d/dt(Δμ/μ) = -0.4 ± 3.0×10⁻¹⁵的时间变化（2σ）。