Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2002-10-22
Phys.Lett.B551:178-186,2003
Physics
High Energy Physics
High Energy Physics - Theory
12 pages, references added; v3: minor correction, to appear in PLB
Scientific paper
10.1016/S0370-2693(02)03023-X
We study noncommutative open string (NCOS) theories realized in string theory with time-dependent backgrounds. Starting from a noncommutative Yang-Mills theory (NCYM) with a constant space-space noncommutativity but in a time-dependent background and making an S-dual transformation, we show that the resulting theory is an NCOS also in a time-dependent background but now with a time-dependent time-space noncommutativity and a time-dependent string scale. The corresponding dual gravity description is also given. A general SL(2,Z) transformation on the NCYM results in an NCOS with a time-dependent time-space noncommutativity and a constant space-space noncommutativity, and also in a time-dependent background.
Cai Rong-Gen
Lu Jian-Xin
Ohta Nobuyoshi
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