Variation of the fine-structure constant in QSO spectra from coherent dark matter oscillations
2004; Oxford University Press; Volume: 349; Issue: 4 Linguagem: Inglês
10.1111/j.1365-2966.2004.07625.x
ISSN1365-2966
AutoresM. G. Barnett, Rainer Dick, Kai E. Wunderle,
Tópico(s)Particle physics theoretical and experimental studies
ResumoWe consider the problem of the evolution of the fine-structure coefficient α under the assumption that the scalar field coupling to the Maxwell term satisfies the condition mt≫ 1 for coherent dark matter oscillations. In this case we find that the coupling scale f in the leading-order coupling −(φ/4f) FμνFμν affects the cosmological evolution of α according to ln(α/α0) ∝ξ(mPl/f) × ln [tanh(t/2τ)/tanh(t0/2τ)]. A fit to the QSO observations by Murphy et al. yields f=ξ× 2.12+0.58−0.37× 105mPl. Here mPl= (8πGN)−1/2 is the reduced Planck mass, and ξ2=ϱφ/ϱm parametrizes the contribution of φ to the matter density in the Universe.
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