TL;DR
This paper reviews cosmological models that allow the fine structure constant to vary over time, discussing their properties and consistency with recent quasar observations indicating such variation since redshift 3.5.
Contribution
It provides a comprehensive review of theories permitting variation of the fine structure constant and compares them with recent observational data.
Findings
Quasar data supports variation of the fine structure constant since redshift 3.5.
Cosmological models can accommodate observed variations.
Theories exhibit specific features consistent with observational constraints.
Abstract
We review properties of cosmological theories for the variation of the fine structure 'constant'. We highlight some general features of the cosmological models that exist in these theories with reference to recent quasar data that are consistent with time-variation in the fine structure 'constant' since a redshift of 3.5.
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