Axions and the graceful exit problem in string cosmology

Nemanja Kaloper, Richard Madden, Keith A Olive

Research output: Contribution to journalArticlepeer-review

54 Scopus citations


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 languageEnglish (US)
Pages (from-to)34-40
Number of pages7
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Issue number1-2
StatePublished - Mar 21 1996

Bibliographical note

Funding 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.


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