Quantum field theories fall into roughly two classes: "gapped" theories (where excited states are separated from the vacuum by an energy gap) and gapless theories. In gapped theories, correlations fall off exponentially with distance, so gapped theories are "almost trivial" at long distances. However, gapless theories have nontrivial correlations at long distances and display complicated and rich physics. In many cases (from boiling water to magnets to theories of quantum gravity), gapless theories have enhanced conformal symmetry and are described by Conformal Field Theory (CFT).
This course will cover nonperturbative methods in CFT, with applications to statistical physics, condensed matter physics, particle physics, and quantum gravity. We will use a combination of analytical and numerical techniques. For example, students will learn how to use computer algebra to study conformal correlation functions, and how to use convex optimization to derive bounds on critical exponents.
Instructor: David Simmons-Duffin, Lauritsen 442, email: dsd.
Offered: Winter and spring terms, 2017-2018.
Class meetings: Tuesday and Thursday 9-10:30am in Lauritsen 469. My office hour is 10:30-11:30 (after class) on Tuesdays.
Grading and homework: This course will be pass/fail. There will be problem sets every other week, which will be posted on this website. Students are encouraged to work together, but should write up their own solutions. Please use LaTeX. Instead of an exam, there will be final presentations at the end of each term.
Prerequisites: Students should have some background in quantum field theory. Come talk to me if you aren't sure whether your background is appropriate.
Because this is the first iteration of this course, I don't know how much material we will cover. Here is a preliminary list of topics.