Theoretical physics is classical applied mathematics. Our deepest understanding of
the world, our most accurate predictions of real phenomena, come from mathematical
models of theoretical physics. Our department offers a wide range of courses in
quantum mechanics, and a number of our department members have spent their lives
trying to improve our understanding of these models.
The topics studied in our department range from the study of the so-called elementary
particles (alas, they're not so elementary to understand) through the behaviour of atoms
to the behaviour of large molecular structures, such as polymers. The level of detail
available, and the precision and accuracy of the mathematical models, of course
changes as we move from one level to the next.