Voids in the distribution of galaxies and the Cosmological constant

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dc.creatorTriay, Roland
dc.creatorFliche, Henri-Hugues
dc.date2008-01-18
dc.date.accessioned2026-07-07T11:39:56Z
dc.date.available2026-07-07T11:39:56Z
dc.descriptionWith the motivation in mind to evaluate the contribution of the cosmological constant $Λ$ on the foam like patterns formation process in the distribution of galaxies, we investigate the Newtonian dynamics of a spherical void embedded in an uniform medium which undergoes a Hubble expansion. We use a covariant approach for deriving the evolution with time of the shell (S) acting as a boundaries condition for the inside and outside media. As a result, with the usual values for the cosmological parameters, S expands with a huge initial burst that freezes up to matching Hubble flow. With respect to Friedmann comoving frame, its magnification increases nonlinearly with $Λ$, with a maximal growth rate at redshift $z\sim 1.7$. The velocity field inside S shows an interesting feature which enables us to disentangle a spatially closed from open universe. Namely, the void region are swept out in the first case, what can be interpreted as a stability criterion.
dc.description4 pages, 1 figure
dc.identifierhttps://arxiv.org/abs/0801.2883
dc.identifierhttp://arxiv.org/abs/0801.2883
dc.identifierProg.Theor.Phys.Suppl.172:40-43,2008
dc.identifierdoi:10.1143/PTPS.172.40
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/200101
dc.subjectGeneral Relativity and Quantum Cosmology
dc.subjectAstrophysics
dc.titleVoids in the distribution of galaxies and the Cosmological constant
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