The Early Universe
Alan Guth's MIT course on modern cosmology, moving from classical cosmology in its first half into particle physics and its impact on the early universe in the second. Guth, the physicist who proposed cosmic inflation, teaches from the Fall 2013 recording, with the full set of lecture videos, slides, problem sets, and exams with solutions posted. The course sits in MIT's Physics department under astrophysics and theoretical physics, aimed at undergraduates who already have a mechanics and electromagnetism background. An MIT Alumni Association podcast linked from the course page has Guth discussing whether our universe is part of a multiverse, a question the later lectures build toward. It is a compact, problem-set-driven route into how physicists reconstruct the universe's first moments.