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arXiv 0903.3979hep-thgr-qc
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弦质量偏移

String Mass Shifts

Diego Chialva

摘要:

我们研究了弦论中的闭合弦单圈振幅,特别是在给定质量和Neveu-Schwarz荷下的平均质量位移。我们的分析仅基于定义良好的弦振幅和利用环面振幅的对称性和么正性。我们得到了D维时空中平均闭弦质量位移的结果Δ M^2 = - g_s^2 M^(2+(3-D)/2)(对于具有非零Neveu-Schwarz荷Q的态,Δ M^2 = - g_s^2(M^2-Q^2)^(1+(3-D)/4))。一个有趣的图片的单圈校正的弦在非超对称的配置出来:主要的相互作用负责这些校正是长程类型(即引力),它似乎微扰理论是普遍可靠的大质量弦态的频谱。

英文摘要:

We study closed string one-loop amplitudes in string theory, in particular the average mass shift for states at given mass and Neveu-Schwarz charges. Our analysis is based only on well-defined string amplitudes and the exploitation of symmetries and unitarity properties of the torus amplitudes. We obtain the result Delta M^2 = - g_s^2 M^(2+(3-D)/2) in D spacetime dimensions for the average closed string mas-shift (Delta M^2 = - g_s^2 (M^2-Q^2)^(1+(3-D)/4) for states with non-zero Neveu-Schwarz charges Q). An interesting picture of one-loop corrections for the string in non-supersymmetric configurations comes out: the dominant interactions responsible for these corrections are of long-range type (namely gravitational) and it appears that perturbations theory is generally reliable on the spectrum of massive string states.

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