标题： 关于(反)德西特空间中零弦的可积结构 显示英文标题

标题： On integrable structure of the null string in (anti-)de Sitter space

摘要： 目前可积性成为研究超共形规范理论与反德西特超空间中弦理论对偶性的关键性质。 在弦理论中研究可积结构的复杂性是由于II型超引力多重态的背景场与弦相互作用的依赖关系，这些背景场依赖于超空间坐标。 这解释了对研究极限情况的兴趣，在这些情况下超弦方程会简化。 在本工作中考虑的是对应于零张力的极限情况，即零张力弦。 得到了在作为齐次空间实现的(反)德西特空间中零张力弦方程的Lax方程形式的表示。 提出了用群变量表示的反德西特空间中(零张力)弦拉格朗日量的扭量解释。 显示英文摘要

摘要： Presently integrability turned the key property in the study of duality between superconformal gauge theories and strings in anti-de Sitter superspaces. Complexity of the study of integrable structure in string theory is caused by complicated dependence of background fields of the Type II supergravity multiplets, with which strings interact, on the superspace coordinates. This explains an interest to study of limiting cases, in which superstring equations simplify. In the present work considered is the limiting case of zero tension corresponding to null string. It is obtained the representation in the form of the Lax equation of null-string equations in (anti-)de Sitter space realized as coset manifold. Proposed is twistor interpretation of the Lagrangian of (null) string in anti-de Sitter space expressed in terms of group variables.