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arXiv 1202.1101hep-thgr-qchep-phmath-phmath.MP
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关于非线性西格玛模型的经典化

On classicalization in nonlinear sigma models

Roberto Percacci, Leslaw Rachwal

摘要:

研究了具有正负目标空间曲率和任意导数的非线性西格玛模型的经典化现象。我们发现,只有两个衍生物的理论表现出一种弱形式的经典化,和定量的结果依赖于曲率的符号。具有高阶导数的非线性西格玛模型表现出与曲率符号无关的强形式的现象。我们认为,弱经典化实际上可能等同于渐近安全,而强经典化似乎是一个真正不同的现象。我们还讨论了经典极限定义中可能存在的歧义。

英文摘要:

We consider the phenomenon of classicalization in nonlinear sigma models with both positive and negative target space curvature and with any number of derivatives. We find that the theories with only two derivatives exhibit a weak form of classicalization, and that the quantitative results depend on the sign of the curvature. Nonlinear sigma models with higher derivatives show a strong form of the phenomenon which is independent of the sign of curvature. We argue that weak classicalization may actually be equivalent to asymptotic safety, whereas strong classicalization seems to be a genuinely different phenomenon. We also discuss possible ambiguities in the definition of the classical limit.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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