Of course the answer really depends of what "life" is, and what "intelligent life" is. If "life" means self-replicating entities, and "intelligence" involves some kind of advanced information sharing and decision making, then intelligent aliens life forms could include solar-powered digital systems in orbit around our sun, observing us with various sensory systems and communicating away from us, but too small for us to have observed yet. It wouldn't require dark matter or dark energy and wouldn't even require much of a projection from our current digital technologies.