Universe acceleration and fine structure constant variation in BSBM theory

Abstract

In this work we investigate the utility of using SNe Ia observations in constraining the cosmological parameters in BSBM theory where a scalar field is responsible for both fine structure constant variation and late time universe acceleration. The model is discussed in the presence of an exponential self potential for the scalar field. Stability and phase space analysis of the solutions are studied. The model is tested against observational data for Hubble parameter and quasar absorption spectra. With the best fitted model parameters, the theory predicts a good match with the experimental results and exhibits fine structure constant variation. The analysis also shows that for the equation of state parameter, recent universe acceleration and possible phantom crossing in future is forecasted.

14 pages, 10 figures, final version with minor modification accepted to be published in JCAP

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Cited by in corpus (5)

• General Dynamics of Varying-Alpha Universes
• Searching for a Cosmological Preferred Axis in complicated class of cosmological models:Case study $f(R,T)$ model
• Probing the time variation of fine structure constant using galaxy clusters and quintessence model
• Varying alpha and cosmic acceleration in Brans-Dicke-BSBM theory: stability analysis and observational tests
• Estimations of the cosmological parameters from the observational variation of the fine structure constant