manybodyteori
Manybodyteori, or many-body theory, is the field that studies systems containing a large number of interacting constituents, such as electrons in atoms and molecules, electrons in solids, or nucleons in nuclei. The central aim is to understand how collective behavior and quantum correlations emerge from the interactions among many degrees of freedom, rather than from single-particle pictures.
The standard framework uses Hamiltonians that describe kinetic energies and interparticle interactions. In practice, the problem
A wide range of methods exists, from mean-field approaches to capture average effects, to highly correlated
Key challenges include the exponential growth of the many-body Hilbert space, entanglement, and, in some methods,