Varying Alpha Driven by the Dirac-Born-Infeld Scalar Field

Abstract

Since about ten years ago, varying $\alpha$ theories attracted many attentions, mainly due to the first observational evidence from the quasar absorption spectra that the fine structure ``constant'' might change with cosmological time. In this work, we investigate the cosmic evolution of $\alpha$ driven by the Dirac-Born-Infeld (DBI) scalar field. To be general, we consider various couplings between the DBI scalar field and the electromagnetic field. We also confront the resulting $\Delta \alpha /\alpha$ with the observational constraints, and find that various cosmological evolution histories of $\Delta \alpha /\alpha$ are allowed. Comparing with the case of varying $\alpha$ driven by quintessence, the corresponding constraints on the parameters of coupling have been relaxed, thanks to the relativistic correction of the DBI scalar field.

12 pages, 1 table, 8 figures, revtex4; v2: discussions added, Phys. Lett. B in press; v3: published version

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• Cosmological Constant, Fine Structure Constant and Beyond
• Cosmic Anisotropy and Fast Radio Bursts
• Observational Constraints on Varying Alpha in $\Lambda (\alpha )$CDM Cosmology
• Alleviating the Hubble Tension with a Local Void and Transitions of the Absolute Magnitude
• Cosmological constraints on $\Lambda (\alpha )$CDM models with time-varying fine structure constant
• Varying Alpha Generalized Dirac-Born-Infeld Models
• Cosmic evolution of scalar fields with multiple vacua: generalized DBI and quintessence
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