Year: 2018
Type: article
Abstract: We impose the first strong-lensing constraints on a wide class of modified gravity models where an extra field that modifies gravity also couples to photons (either directly or indirectly through a coupling with baryons) and thus modifies lensing. We use the nonsingular isothermal ellipsoid profile as an effective potential which produces flat galactic rotational curves. If a concrete modified gravity model gives a flat rotational curve, then the parameter $\mathrm{\ensuremath{\Gamma}}$ that characterizes the lensing effect must take some definite value. We find that $\mathrm{\ensuremath{\Gamma}}=1.24\ifmmode\pm\else\textpm\fi{}0.65$ at $1\ensuremath{\sigma}$, consistent with general relativity ($\mathrm{\ensuremath{\Gamma}}=1$). This constrains the parameter space in some recently proposed models.
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2904992174