标题： 弦宇宙学的状态：现象学方面 显示英文标题

标题： Status of String Cosmology: Phenomenological Aspects

摘要： 我报告了关于弦宇宙学中典型“原大爆炸”情景下扰动演化的最新研究，重点在于遗迹光子和引力子的随机背景的形成及其可能的直接/间接可观测后果。 我也讨论了通过使用一个简单的引力轴子-膨胀子模型来生成热微波背景的可能性，该模型的经典演化平滑地连接了暴胀膨胀与减速收缩。 通过包括所产生的辐射的量子反作用，该模型最终趋于标准的辐射主导（恒定膨胀子）阶段。 显示英文摘要

摘要： I report recent studies on the evolution of perturbations in the context of the ``pre-big-bang" scenario typical of string cosmology, with emphasis on the formation of a stochastic background of relic photons and gravitons, and its possible direct/indirect observable consequences. I also discuss the possible generation of a thermal microwave background by using, as example, a simple gravi-axio-dilaton model whose classical evolution connects smoothly inflationary expansion to decelerated contraction. By including the quantum back-reaction of the produced radiation the model eventually approaches the standard radiation-dominated (constant dilaton) regime.