標題: Notes on high-energy limit of bosonic closed string scattering amplitudes
作者: Chan, Chuan-Tsung
Lee, Jen-Chi
Yang, Yi
電子物理學系
Department of Electrophysics
公開日期: 14-Aug-2006
摘要: We study bosonic closed string scattering amplitudes in the high-energy limit. We find that the methods of decoupling of high-energy zero-norm states and the high-energy Virasoto constraints, which were adopted in the previous works to calculate the ratios among high-energy open string scattering amplitudes of different string states, persist for the case of closed string. However, we clarify the previous saddle-point calculation for high-energy open string scattering amplitudes and claim that only (t, u) channel of the amplitudes is suitable for saddle-point calculation. We then discuss three evidences to show that saddle-point calculation for high-energy closed string scattering amplitudes is not reliable. By using the relation of tree-level closed and open string scattering amplitudes of Kawai, Lewellen and Tye (KLT), we calculate the high-energy closed string scattering amplitudes for arbitrary mass levels. For the case of high-energy closed string four-tachyon amplitude, our result differs from the previous one of Gross and Mende, which is NOT consistent with KLT formula, by an oscillating factor. (c) 2006 Elsevier B.V. All rights reserved.
URI: http://dx.doi.org/10.1016/j.nuclphysb.2006.05.024
http://hdl.handle.net/11536/11918
ISSN: 0550-3213
DOI: 10.1016/j.nuclphysb.2006.05.024
期刊: NUCLEAR PHYSICS B
Volume: 749
Issue: 1-3
起始頁: 280
結束頁: 290
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