Composition-dependent long range forces from varying m_p/m_e

Details Composition-dependent long range forces from varying m_p/m_e Composition-dependent long range forces from varying m_p/m_e

2006-08-04

arxiv.org/abs/hep-ph/0608067v1

JCAP 0701:013,2007

Physics

High Energy Physics

High Energy Physics - Phenomenology

15 pages

Scientific paper

10.1088/1475-7516/2007/01/013

We relate possible cosmological variations in the mass ratio mu \equiv m_p/m_e and the fine structure constant alpha to long-range composition-dependent forces mediated by a scalar field. The differential acceleration eta in Eotvos-type experiments is bounded below by 10^{-14}, except in cases where one or more scalar couplings vanish. We consider what values for these couplings could arise from unified theories. By considering the contribution of the scalar field to the cosmological energy density we use bounds on eta to put upper bounds on the current rate of change of mu and alpha.

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