Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2003-11-14
JHEP 0401 (2004) 040
Physics
High Energy Physics
High Energy Physics - Theory
27 pages, 3 figures, LaTeX JHEP style; references added
Scientific paper
10.1088/1126-6708/2004/01/040
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.
Bassetto Antonio
Torrielli Alessandro
Valandro Roberto
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