INTRODUCTION TO MANY BODY THEORY

Second cycle degree in PHYSICS

Campus: PADOVA

Language: English

Teaching period: Second Semester

Lecturer: PIER LUIGI SILVESTRELLI

Number of ECTS credits allocated: 6


Syllabus
Prerequisites: Metodi Matematici
Examination methods: Oral exam and home-work exercises.
Course unit contents: Second-quantization formalism.
Single-particle and two-particle operators in second quantization.
Hamiltonian of Coulomb systems.
Two-point Green functions; expectation value of a single-particle
operator, ground-state energy, Lehmann representation.
Adiabatic theorem and perturbative evaluation of the ground state.
Wick's theorem and Feynman diagrams for fermionic systems at T=0.
Self-energy, polarization diagrams (effective interaction), Dyson's
equations.
Ground-state energy of the degenerate electron gas ("jellium" model)
in the ring approximation (RPA).
Linear-response theory; applications:
screening of the electric charge (Friedel oscillations),
plasma oscillations, electronic scattering cross section for the
inelastic electron scattering.
Interacting Bose systems at T=0.
Temperature Green's functions: Wick-Matsubara' theorem and
Feynman diagrams.