| Issue |
EAS Publications Series
Volume 30, 2008
Spanish Relativity Meeting - Encuentros Relativistas Españoles , ERE2007: Relativistic Astrophysics and Cosmology
|
|
|---|---|---|
| Page(s) | 303 - 306 | |
| DOI | https://doi.org/10.1051/eas:0830049 | |
| Published online | 30 September 2008 | |
Spanish Relativity Meeting - Encuentros Relativistas Españoles
, ERE2007:
Relativistic Astrophysics and Cosmology
A. Oscoz, E. Mediavilla and M. Serra-Ricart (eds)
EAS Publications Series, 30 (2008) 303-306
A. Oscoz, E. Mediavilla and M. Serra-Ricart (eds)
EAS Publications Series, 30 (2008) 303-306
Probing the creatable character of some significant universe models
Departament D'Astronomia i Astrofísica,
Universitat de València, 46100-Burjassot, València, Spain
An unambiguous physical definition of creatable universes was recently proposed. According to it, flat and closed Friedmann-Robertson-Walker (FRW) backgrounds can be created as quantum vacuum fluctuations, whereas open backgrounds are not creatable. Here, physically motivated perturbations of closed and flat backgrounds are analyzed. Various creatable perturbed FRW universes are thus found. Some of them involve scalar and tensor perturbations with appropriate spectra, whereas other ones are Bianchi models.
© EAS, EDP Sciences, 2008