The Flow Equation Approach to Many-Particle Systems

The book explores the flow equation method, a versatile theoretical approach to quantum many-body physics that enhances the understanding of Hamiltonians by making them increasingly energy-diagonal. Unlike conventional scaling methods that focus on low-energy subspaces, this approach retains the full Hilbert space, enabling calculations across all energy scales. It has been applied to various problems, including dissipative systems and correlated electron physics, and is particularly effective for studying quantum many-body non-equilibrium issues, making it a timely compilation of existing research.