Physics and Metaphysics

Experiment plays a decisive role in physics. It is the single source of our understanding of nature. But, during the last century the main accent in theoretical physics has moved toward metaphysics. Some mathematicians/theoreticians try to develop new approaches, ignoring experiments. Three examples of such treatment are discussed here: the Gutzwiller approach, the classical description of the tunneling phenomenon and the role of irregular motion in classical mechanics. The foundations of special relativity are also discussed.