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Abstract: Abridged The ammonia method, which has been proposed to explore theelectron-to-proton mass ratio, mu = m e-m p, is applied to nearby dark cloudsin the Milky Way. This ratio, which is measured in different physicalenvironments of high terrestrial and low interstellar densities of baryonicmatter is supposed to vary in chameleon-like scalar field models, which predictstrong dependence of both masses and coupling constant on the local matterdensity. High resolution spectral observations of molecular cores in lines ofNH3 J,K = 1,1, HC3N J = 2-1, and N2H+ J = 1-0 were performed at three radiotelescopes to measure the radial velocity offsets, DeltaV = V rot - V inv,between the inversion transition of NH3 1,1 and the rotational transitions ofother molecules with different sensitivities to the parameter dmm = mu obs -mu lab-mu lab. The measured values of DeltaV exhibit a statisticallysignificant velocity offset of 23 +- 4 stat +- 3 sys m-s. When interpreted interms of the electron-to-proton mass ratio variation, this infers that dmm =2.2 +- 0.4 stat +- 0.3 sysx10^{-8}. If only a conservative upper bound isconsidered, then the maximum offset between ammonia and the other molecules is|DeltaV| <= 30 m-s. This gives the most accurate reference point at z = 0 fordmm: |dmm| <= 3x10^{-8}.



Author: S. A. Levshakov, P. Molaro, A. V. Lapinov, D. Reimers, C. Henkel, T. Sakai

Source: https://arxiv.org/







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