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Effective Field Theory for Fermi Systems in a Large N Expansion

✍ Scribed by R.J. Furnstahl; H.-W. Hammer

Publisher: Elsevier Science
Year: 2002
Tongue: English
Weight: 197 KB
Volume: 302
Category: Article
ISSN: 0003-4916
DOI: 10.1006/aphy.2002.6313

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✦ Synopsis

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 spinisospin degeneracy g. Numerical results at next-to-leading order are presented and the connection to the Bose limit of this system is elucidated.

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