2002/10/31 by Rong-Gen Cai, J.X. Lu, Jian-Xin Lu +1 · 5 citations
Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #Noncommutative and Quantum Gravity Theories #hep-th
paper · pdf · doi:10.1016/s0370-2693(02)03023-x
published as Phys.Lett.B551:178-186,2003 · 12 pages, references added; v3: minor correction, to appear in PLB
arxiv created 2002/11/19 · openalex publication_date 2002/12/27 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/02
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.