Gravitational lens time-delay as a probe of a possible time variation of the fine-structure constant

A new method based on large scale structure observations is proposed to probe a possible temporal variation of the fine-structure constant ( α ). Our analyses are based on time-delay of Strong Gravitational Lensing and Type Ia Supernovae observations. By considering the runaway dilaton scenario, where the cosmological temporal evolution of the fine-structure constant is given by Δ α α ≈ - γ ln ( 1 + z ) , we obtain limits on the physical properties parameter of the model ( γ ) at the level 10 - 2 ( 1 σ ). Although our limits are less restrictive than those obtained by quasar spectroscopy, the approach presented here provides new bounds on the possibility of Δ α α ≠ 0 at a different range of redshifts.