Electromagnetic Duality and New Solutions of the Non-minimally Coupled Y(R)-Maxwell Gravity

Non-minimally coupled Y®-Maxwell gravity which have some interesting solutions may be used to understand dark matter, dark energy, the origin of cosmic magnetic field and the evaluation of the universe. We give some new solutions to the model such as spherically symmetric electric, magnetic and dyon solutions. We point out an existence of an electromagnetic duality transformation for the model.