Lectures in course PHYS-426: Quantum physics IV

Explores the fixed energy propagator, its analytic structure, boundary conditions, and applications in quantum systems.

Explores the semiclassical approximation to the fixed energy propagator and tunneling probability across a potential barrier.

Explores barrier penetration, saddle points, and analytic wavefunction structures in quantum physics.

Discusses instantons in quantum mechanics and their role in capturing missed effects.

Explores instantons in quantum field theory, focusing on the instanton prefactor and the role of the zero mode.

Explores the interaction of particles with external electromagnetic fields and the quantum behavior in magnetic fields.