Unitarity of noncommutative field theories from string theory

Details Unitarity of noncommutative field theories from string theory Unitarity of noncommutative field theories from string theory

2003-07-09

arxiv.org/abs/hep-th/0307089v1

Mod.Phys.Lett. A18 (2003) 2525-2532

Physics

High Energy Physics

High Energy Physics - Theory

8 pages, no figures. Work done in collaboration with A. Bassetto and R. Valandro (Padua Univ.). Submitted for the proceedings

Scientific paper

10.1142/S0217732303012775

We improve the study of the lack of perturbative unitarity of noncommutative space-time quantum field theories derived from open string theory in electric backgrounds, enforcing the universality of the mechanism by which a tachyonic branch cut appears when the Seiberg-Witten limit freezes the string in an unstable vacuum. The main example is realized in the context of the on-shell four-tachyon amplitude of the bosonic string, and the dependence of the phenomenon on the brane-worldvolume dimension is analysed. We discuss the possibility of a proof in superstring theory, and finally mention the NCOS limit in this framework.

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