Accelerated Expansion: Theory and Observations
arXiv:astro-ph/0109349 · doi:10.1023/A:1017509430993
Abstract
The present paradigm in cosmology is the usual Big-Bang Cosmology in which two stages of accelerated expansion are incorporated: the inflationary phase in the very early universe which produces the classical inhomogeneities observed in the universe, and a second stage of acceleration at the present time as the latest Supernovae observations seem to imply. Both stages could be produced by a scalar field and observations will strongly constrain the microscopic lagrangian of any proposed model.
Proceedings of the Helsinki Conference: Symposium on Ultra Low Energy Physics; 9 pages, uses jltp.cls. Published in Journal of Low Temperature Physics, Vol. 124, Nos 1/2, 17 (2001)