After the work of Rindler and Ishak, it is now well established that the bending of light is influenced by the cosmological constant {Lambda} appearing in the Schwarzschild-de Sitter spacetime. We show that their method, when applied to the galactic
halo gravity parametrized by a constant {gamma}, yields exactly the same {gamma}- correction to Schwarzschild bending as obtained by standard methods. Different cases are analyzed, which include some corrections to the special cases considered in the original paper by Rindler and Ishak.
Several aspects of the 4d imprint of the 5d bulk Weyl radiation are investigated within a recently proposed model solution. It is shown that the solution has a number of physically interesting properties. The constraints on the model imposed by combi
ned measurements of rotation curve and lensing are discussed. A brief comparison with a well known scalar field model is also given.
Using a unified approach of optical-mechanical analogy in a semiclassical formula, we evaluate the effect of Chern-Simons modified gravity on the quantum phase shift of de Broglie waves in neutron interferometry. The phase shift calculated here revea
ls, in a single equation, a combination of effects coming from Newtonian gravity, inertial forces, Schwarzschild and Chern-Simons modified gravity. However the last two effects, though new, turn out to be too tiny to be observed, and hence only of academic interest at present. The approximations, wherever used, as well as the drawbacks of the non-dynamical approach are clearly indicated.
