Matching LTB and FRW spacetimes through a null hypersurface

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dc.creatorKhakshournia, S.
dc.creatorMansouri, R.
dc.date2007-02-24
dc.date.accessioned2026-07-07T12:16:46Z
dc.date.available2026-07-07T12:16:46Z
dc.descriptionMatching of a LTB metric representing dust matter to a background FRW universe across a null hypersurface is studied. In general, an unrestricted matching is possible only if the background FRW is flat or open. There is in general no gravitational impulsive wave present on the null hypersurface which is shear-free and expanding. Special cases of the vanishing pressure or energy density on the hypersurface is discussed. In the case of vanishing energy momentum tensor of the null hypersurface, i.e. in the case of a null boundary, it turns out that all possible definitions of the Hubble parameter on the null hypersurface, being those of LTB or that of FRW, are equivalent, and that a flat FRW can only be joined smoothly to a flat LTB.
dc.description9 pages
dc.identifierhttps://arxiv.org/abs/gr-qc/0702130
dc.identifierhttp://arxiv.org/abs/gr-qc/0702130
dc.identifierGrav.Cosmol.14:295-300,2008
dc.identifierdoi:10.1134/S0202289308040014
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/211906
dc.subjectGeneral Relativity and Quantum Cosmology
dc.subjectAstrophysics
dc.titleMatching LTB and FRW spacetimes through a null hypersurface
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