MG11 
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Abstract

Kerr black hole lensing in the weak field limit

Gravitational lensing by a Kerr black hole is investigated in the weak deflection limit. Considering higher order corrections in the black hole spin, we perform an analytical study of the lens equation and provide a description of critical cirves and caustics.

Solar and stellar system tests of dark matter and cosmological constant.

Some classical tests of gravity theories are applied in solar and stellar systems to constrain the cosmological constant and the local dark matter density. Best bounds from the solar system come from perihelion advance and change in mean motion of Earth and Mars. Limit fall very short to estimates from observational cosmology analyses but future experiments performing radio ranging observations of outer planets could improve it by several orders of magnitude.