Starting from the 10-dimensional low-energy string effective action for the graviton and dilaton, we study cosmological implications of string theory. We find some solutions for the string equations of motion both in vacuum and with the presence of matter. / The scale factors r and R, which can be interpreted as the radii of the universe, tend to evolve in opposite directions: one radius expands and the other shrinks. / We also study the flatness problem and propose an alternative solution to this problem. / The behaviour of the radii r and R rear the Planck length $({ sim}10 sp{-33}$cm) is studied in detail. / The significance of our results lies in the fact that in the context of string theory, we may have a good chance of observing several large spatial dimensions, with other internal spatial dimensions remaining small and unobserved from a macroscopic point of view.
| Identifer | oai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:QMM.39445 |
| Date | January 1992 |
| Creators | Takeuchi, Kaoru |
| Publisher | McGill University |
| Source Sets | Library and Archives Canada ETDs Repository / Centre d'archives des thèses électroniques de Bibliothèque et Archives Canada |
| Language | English |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
| Format | application/pdf |
| Coverage | Doctor of Philosophy (Department of Physics.) |
| Rights | All items in eScholarship@McGill are protected by copyright with all rights reserved unless otherwise indicated. |
| Relation | alephsysno: 001318750, proquestno: NN80444, Theses scanned by UMI/ProQuest. |
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