Please use this identifier to cite or link to this item: http://hdl.handle.net/1822/16206

TitleThe role of shell crossing on the existence and stability of trapped matter shells in spherical inhomogeneous Lambda-CDM models
Author(s)Mena, Filipe C.
Delliou, Morgan Le
Mimoso, José P.
Issue date2011
PublisherAmerican Physical Society
JournalPhysical Review D
Abstract(s)We analyse the dynamics of trapped matter shells in spherically symmetric inhomogeneous Lambda- CDM models. The investigation uses a Generalised Lemaître-Tolman-Bondi description with initial conditions subject to the constraints of having spatially asymptotic cosmological expansion, initial Hubble-type flow and a regular initial density distribution. We discuss the effects of shell crossing and use a qualitative description of the local trapped matter shells to explore global properties of the models. Once shell crossing occurs, we find a splitting of the global shells separating expansion from collapse into, at most, two global shells: an inner and an outer limit trapped matter shell. In the case of expanding models, the outer limit trapped matter shell necessarily exists. We also study the role of shear in this process, compare our analysis with the Newtonian framework and give concrete examples using density profile models of structure formation in cosmology.
TypeArticle
URIhttp://hdl.handle.net/1822/16206
ISSN1550-2368
1550-7998
Publisher versionhttp://prd.aps.org/abstract/PRD/v83/i10/e103528
Peer-Reviewedyes
AccessRestricted access (UMinho)
Appears in Collections:CMAT - Artigos em revistas com arbitragem / Papers in peer review journals

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