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arXiv 0705.1816hep-thgr-qc
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超高能弦散射中的引力效应

Gravitational effects in ultrahigh-energy string scattering

Steven B. Giddings, David J. Gross, Anshuman Maharana

摘要:

研究超高能弦散射,以阐明弦效应和引力效应的相对作用,以及它们对非定域行为的可能贡献。不同的状态可以通过在固定能量下改变碰撞参量来表征。在动量传递达到弦尺度的情况下,弦效应似乎低于通过程函近似的高圈引力过程。在较小的碰撞参量,“衍射”或“潮汐”弦激发导致的过程中占主导地位的高度兴奋的字符串。然而,新的证据表明,这些激发效应不发挥直接的作用,在黑洞的形成,这对应于重力微扰理论的崩溃,并出现在足够小的碰撞参量占主导地位。估计的振幅违反了局部理论的高能量行为的预期界限。

英文摘要:

Ultrahigh-energy string scattering is investigated to clarify the relative role of string and gravitational effects, and their possible contributions to nonlocal behavior. Different regimes can be characterized by varying the impact parameter at fixed energy. In the regime where momentum transfers reach the string scale, string effects appear subdominant to higher-loop gravitational processes, approximated via the eikonal. At smaller impact parameters, "diffractive" or "tidal" string excitation leads to processes dominated by highly excited strings. However, new evidence is presented that these excitation effects do not play a direct role in black hole formation, which corresponds to breakdown of gravitational perturbation theory and appears to dominate at sufficiently small impact parameters. The estimated amplitudes violate expected bounds on high-energy behavior for local theories.

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