标题： 弯曲时空中的超弦引力现象 显示英文标题

标题： Gravitational Phenomena from Superstrings in Curved Spacetime

摘要： 四维超弦解在低能下定义了有效的超引力理论。 其中一类成功地将标准模型的适用范围扩展到了弦尺度（${\cal O}(10^{17})~TeV$）。 我们强调了与低能（${\cal O}(1)~TeV$）规范耦合和 Yukawa 耦合的预测以及超对称粒子谱相关的弦修正的重要性。 还介绍了一类精确的弦解，提供了非平凡的空间-时间背景，从中我们可以得出一些关于空间-时间区域的教训，在这些区域中有效场论的规则有意义。 我们展示了弦引力现象可能在宇宙学演化过程中诱导从一种有效场论规则到另一种规则的转变，在后一种规则中几何和拓扑数据以及相关的可观测态会有显著的不同。 C. Kounnas 在第29届 Moriond 会议（法国 Méribel）上所做的报告。 显示英文摘要

摘要： The four-dimensional superstring solutions define at low energy effective supergravity theories. A class of them extends successfully the validity of the standard model up to the string scale (${\cal O}(10^{17})~TeV$). We stress the importance of string corrections which are relevant for low energy (${\cal O}(1)~TeV$) predictions of gauge and Yukawa couplings as well as the spectrum of the supersymmetric particles. A class of exact string solutions are also presented, providing non trivial space-time backgrounds, from which we can draw some lessons concerning the regions of space-time where the notion of the effective field theory prescription make sense. We show that the string gravitational phenomena may induce during the cosmological evolution, transitions from one effective field theory prescription to a different one where the geometrical and topological data, as well as the relevant observable states are drastically different. Talk presented by C. Kounnas in the XXIX Moriond Meeting, M\'eribel, France.