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Unitarity of noncommutative field theories from string theory

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Publication details

JournalModern Phys. Lett. A
DatePublished - 9 Jul 2003
Issue number33-35
Pages (from-to)2525-2532
Original languageEnglish


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.

Bibliographical note

8 pages, no figures. Work done in collaboration with A. Bassetto and
R. Valandro (Padua Univ.). Submitted for the proceedings of the conference
"Spacetime and Fundamental Interactions: Quantum Aspects. A conference to
honour A.P.Balachandran's 65th birthday", Vietri, 26-31 May 2003

    Research areas

  • hep-th

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