Why haven't we discovered dark matter yet? A theorist's apology

Why haven't we discovered dark matter yet? A theorist's apology.

A preponderance of astronomical evidence suggests that the galaxy is filled with dark matter. Despite knowing remarkably little about what this dark matter is, we expect that it is not composed of ordinary matter. Though we have spent 30 years expecting that it may be related to pressing open problems in fundamental physics, a heroic experimental program has shown that dark matter is even more elusive than we had initially imagined. In this talk we highlight new directions in the post-Higgs era of dark matter physics and address the broader question of how theoretical physics contributes to discovering the unknown.