Probing variation of the fine-structure constant in runaway dilaton models using Strong Gravitational Lensing and Type Ia Supernovae
Abstract
In order to probe a possible time variation of the fine-structure constant (α ), we propose a new method based on Strong Gravitational Lensing and Type Ia Supernovae observations. By considering a class of runaway dilaton models, where Δ/α α =-γ ln(1 +z ) , we obtain constraints on Δ/α α at the level γ ∼10-2 (γ captures the physical properties of the model). Since the data set covers the redshift range 0.075 ≤z ≤2.2649 , the constraints derived here provide independent bounds on a possible time variation of α at low, intermediate and high redshifts.
- Publication:
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European Physical Journal C
- Pub Date:
- September 2021
- DOI:
- 10.1140/epjc/s10052-021-09625-4
- arXiv:
- arXiv:2004.08484
- Bibcode:
- 2021EPJC...81..822C
- Keywords:
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- Astrophysics - Cosmology and Nongalactic Astrophysics;
- Astrophysics - Astrophysics of Galaxies
- E-Print:
- 9 pages, 3 figures, 1 table - Accepted in The European Physical Journal C