Phys. Rev. D 66, 046005 (2002) [14 pages]Density perturbations in the ekpyrotic scenarioReceived 17 September 2001; published 26 August 2002 We study the generation of density perturbations in the ekpyrotic scenario for the early universe, including gravitational backreaction. We expose interesting subtleties that apply to both inflationary and ekpyrotic models. Our analysis includes a detailed proposal of how the perturbations generated in a contracting phase may be matched across a “bounce” to those in an expanding hot big bang phase. For the physical conditions relevant to the ekpyrotic scenario, we reobtain our earlier result of a nearly scale-invariant spectrum of energy density perturbations. We find that the perturbation amplitude is typically small, as desired to match observation. © 2002 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevD.66.046005
DOI:
10.1103/PhysRevD.66.046005
PACS:
11.25.-w, 04.50.+h, 98.62.Py, 98.80.Es
|
|
About | Terms and Conditions | Subscriptions | Search | Help
Use of the American Physical Society websites and journals implies that the user has read and agrees to our Terms and Conditions and any applicable Subscription Agreement. Physical Review®, Physical Review Letters®, Reviews of Modern Physics®, and Physical Review Special Topics® are trademarks of the American Physical Society.