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One-loop unitarity of string theories in a constant external background and their Seiberg-Witten limit

Bassetto, A, Torrielli, A and Valandro, R (2004) One-loop unitarity of string theories in a constant external background and their Seiberg-Witten limit Journal of High Energy Physics (01). 040 - ?. ISSN 1029-8479

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Abstract

Perturbative spectra and related factorization properties of one-loop open string amplitudes in the presence of a constant external background B are analysed in detail. While the pattern of the closed string spectrum, obtained after a careful study of the properly symmetrized amplitudes, turns out to be unaffected by the presence of B, a series of double open-string poles, which would be absent when B is turned off, can couple owing to a partial symmetry loss. These features are studied first in a bosonic setting and then generalized in the more satisfactory superstring context. When the background is of an ``electric'' type, a classical perturbative instability is produced beyond a critical value of the electric field. In the Seiberg-Witten limit this instability is the origin of the unphysical tachyonic cut occurring in the non-planar amplitudes of the corresponding noncommutative field theories.

Item Type: Article
Additional Information: Copyright 2004 Institute of Physics. This is the author's accepted manuscript.
Related URLs:
Divisions: Faculty of Engineering and Physical Sciences > Mathematics
Depositing User: Symplectic Elements
Date Deposited: 21 Feb 2012 14:50
Last Modified: 23 Sep 2013 18:57
URI: http://epubs.surrey.ac.uk/id/eprint/72392

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