## Physics

Article

10-10-2006

English

Physics

#### Description/Abstract

In this paper we conduct a numerical study of the supersymmetric O(3) non-linear sigma model. The lattice formulation we employ was derived in \cite{sigma1} and corresponds to a discretization of a {\it twisted} form of the continuum action. The twisting process exposes a {\it nilpotent} supercharge Q and allows the action to be rewritten in Q-exact form. These properties may be maintained on the lattice. We show how to deform the theory by the addition of potential terms which preserve the supersymmetry. A Wilson mass operator may be introduced in this way with a minimal breaking of supersymmetry. We additionally show how to rewrite the theory in the language of K\"{a}hler-Dirac fields and explain why this avenue does not provide a good route to discretization. Our numerical results provide strong evidence for a restoration of full supersymmetry in the continuum limit {\it without} fine tuning. We also observe a non-vanishing chiral condensate as expected from continuum instanton calculations.

33 pages, 12 figures. Two references added and minor typos corrected. Expanded discussion of renormalization issues. Version to be published in JHEP More information at http://arxiv.org/abs/hep-lat/0607010

#### Source

Harvested from Arxiv.org