标题： 解决超弦宇宙学中的优雅退出问题 显示英文标题

标题： Solving the Graceful Exit Problem in Superstring Cosmology

摘要： 我们简要回顾了超弦宇宙学中“优雅退出”问题的现状，并提出一种可能的解决方法。 结果显示，在引入量子修正的情况下，二维稀疏重力中存在该问题的解。 这类似于最近Rey提出的解决方案。 然而，与他的情况不同，在我们的一环修正模型中，无论理论中存在多少有限数量的无质量标量物质场，优雅退出问题都能得到解决。 显示英文摘要

摘要： We briefly review the status of the ``graceful exit'' problem in superstring cosmology and present a possible resolution. It is shown that there exists a solution to this problem in two-dimensional dilaton gravity provided quantum corrections are incorporated. This is similar to the recently proposed solution of Rey. However, unlike in his case, in our one-loop corrected model the graceful exit problem is solved for any finite number of massless scalar matter fields present in the theory.