Twentieth Arnold Sommerfeld Lecture Series, In recent decades, physicists and astronomers have discovered two beautiful

Standard Models, one for the quantum world of extremely short distances, and one

for the universe as a whole. Both models have had spectacular success, but there are

also strong arguments for new physics beyond these models. In this lecture, we will

review these models, their successes and their shortfalls. We will describe how

experiments in the near future could point to new physics suggesting a profound

conceptual revolution, which could change our view of the world.