6533b872fe1ef96bd12d4149
RESEARCH PRODUCT
Probing the creatable character of some significant universe models
D. SáezR. Lapiedrasubject
Physicsmedia_common.quotation_subjectScalar (mathematics)General EngineeringAstronomy and AstrophysicsUniverseGeneral Relativity and Quantum CosmologyTheoretical physicssymbols.namesakeCharacter (mathematics)Vacuum energySpace and Planetary ScienceFriedmann–Lemaître–Robertson–Walker metricsymbolsTensormedia_commondescription
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.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2008-01-01 | EAS Publications Series |