Effective Field Theory for Fermi Systems in a large N expansion

Abstract

A system of fermions with short-range interactions at finite density is studied using the framework of effective field theory. The effective action formalism for fermions with auxiliary fields leads to a loop expansion in which particle-hole bubbles are resummed to all orders. For spin-independent interactions, the loop expansion is equivalent to a systematic expansion in 1/N, where "N" is the spin-isospin degeneracy g. Numerical results at next-to-leading order are presented and the connection to the Bose limit of this system is elucidated.

25 pages, 10 figures, REVTeX4

References in corpus (3)

• Neutron Radii in Mean-Field Models
• Are Occupation Numbers Observable?
• What is Renormalization?

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