University of Surrey

Test tubes in the lab Research in the ATI Dance Research

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

[img]
Preview
PDF
BTV.pdf

Download (301kB)

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
Divisions : Faculty of Engineering and Physical Sciences > Mathematics
Authors :
AuthorsEmail
Bassetto, AUNSPECIFIED
Torrielli, AUNSPECIFIED
Valandro, RUNSPECIFIED
Date : 1 January 2004
Identification Number : 10.1088/1126-6708/2004/01/040
Related URLs :
Additional Information : Copyright 2004 Institute of Physics. This is the author's accepted manuscript.
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

Actions (login required)

View Item View Item

Downloads

Downloads per month over past year


Information about this web site

© The University of Surrey, Guildford, Surrey, GU2 7XH, United Kingdom.
+44 (0)1483 300800