Probing variation of the fine-structure constant in runaway dilaton models using Strong Gravitational Lensing and Type Ia Supernovae. (arXiv:2004.08484v5 [astro-ph.CO] UPDATED)
<a href="http://arxiv.org/find/astro-ph/1/au:+Colaco_L/0/1/0/all/0/1">L. R. Colaço</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Holanda_R/0/1/0/all/0/1">R. F. L. Holanda</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Silva_R/0/1/0/all/0/1">R. Silva</a>
In order to probe a possible time variation of the fine-structure constant
($alpha$), we propose a new method based on Strong Gravitational Lensing and
Type Ia Supernovae observations. By considering a class of dilaton runaway
models, where $frac{Delta alpha}{alpha}= – gamma ln{(1+z)}$, we obtain
constraints on $frac{Delta alpha}{alpha}$ at the level $gamma approx
10^{-2}$ ($gamma$ captures the physical properties of the model). Since the
data set covers the redshift range $0.075 leq z leq 2.2649$, the constraints
derived here provide independent bounds on a possible time variation of
$alpha$ at low, intermediate and high redshifts.
In order to probe a possible time variation of the fine-structure constant
($alpha$), we propose a new method based on Strong Gravitational Lensing and
Type Ia Supernovae observations. By considering a class of dilaton runaway
models, where $frac{Delta alpha}{alpha}= – gamma ln{(1+z)}$, we obtain
constraints on $frac{Delta alpha}{alpha}$ at the level $gamma approx
10^{-2}$ ($gamma$ captures the physical properties of the model). Since the
data set covers the redshift range $0.075 leq z leq 2.2649$, the constraints
derived here provide independent bounds on a possible time variation of
$alpha$ at low, intermediate and high redshifts.
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