We reexamine the graceful exit problem in the Pre-Big-Bang inflationary scenario. The dilaton-gravity action is generalized by adding the axion and a general axion/dilaton potential. We provide a phase space analysis of the dynamics which leads us to extend the previous no-go theorem and rule out the branch change necessary for graceful exit in this context.
|Original language||English (US)|
|Number of pages||7|
|Journal||Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics|
|State||Published - Mar 21 1996|
Bibliographical noteFunding Information:
We would like to thank M. Gasperini, R. Khuri, E. Kiritsis, and G. Veneziano for helpful conversations. This work was supportedi n part by DOE grant DE-FG02-94ER40823, and in part by NSERC of Canada. NK was also supportedi n part by an NSERC postdoctoral fellowship.