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arXiv 0708.4261hep-th
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世界片交换βγCFT与非相对论性弦论

World Sheet Commuting βγCFT and Non-Relativistic String Theories

Bom Soo Kim

摘要:

我们构造了一个在平坦目标空间中具有伽利略对称性的二维西格玛模型,类似于在10个平坦时空维中具有洛伦兹对称性的临界弦论的西格玛模型。这是出于Gomis和Ooguri \cite{Gomis:2000bd}和Danielsson et. \cite{Danielsson:2000gi, Danielsson:2000mu} .我们的理论比他们的理论简单得多,而且不假定一个紧坐标。这个非相对论性弦论有一个玻色子物质$βγ$ CFT,其共形权为$β$ 1。通过伽利略推进对称性的显式实现,将时间识别为$γ$和$\barγ$的线性组合是很自然的。$γ$和$\barγ$之间的角度参数化选择扇区的一个参数族。这些选择扇区负责在非相对论设置中具有非平凡拓扑的非相对论色散关系,这是与以前的作品\cite{Gomis:2000bd, Danielsson:2000gi, Danielsson:2000mu}的主要区别之一。这个简单的理论是临界弦论的非相对论性类比,而且还有许多不同的研究方向。我们提到了一个可能的一致推广这个理论与不同的共形权重的$βγ$ CFT。我们也提到这些理论的超对称推广。

英文摘要:

We construct a sigma model in two dimensions with Galilean symmetry in flat target space similar to the sigma model of the critical string theory with Lorentz symmetry in 10 flat spacetime dimensions. This is motivated by the works of Gomis and Ooguri\cite{Gomis:2000bd} and Danielsson et. al. \cite{Danielsson:2000gi, Danielsson:2000mu}. Our theory is much simpler than their theory and does not assume a compact coordinate. This non-relativistic string theory has a bosonic matter $βγ$ CFT with the conformal weight of $β$ as 1. It is natural to identify time as a linear combination of $γ$ and $\barγ$ through an explicit realization of the Galilean boost symmetry. The angle between $γ$ and $\barγ$ parametrizes one parameter family of selection sectors. These selection sectors are responsible for having a non-relativistic dispersion relation without a nontrivial topology in the non-relativistic setup, which is one of the major differences from the previous works\cite{Gomis:2000bd, Danielsson:2000gi, Danielsson:2000mu}. This simple theory is the non-relativistic analogue of the critical string theory, and there are many different avenues ahead to be investigated. We mention a possible consistent generalization of this theory with different conformal weights for the $βγ$ CFT. We also mention supersymmetric generalizations of these theories.

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