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Verfasst von:Meyer, Sven [VerfasserIn]   i
 Bartelmann, Matthias [VerfasserIn]   i
Titel:Linear perturbations in spherically symmetric dust cosmologies including a cosmological constant
Verf.angabe:Sven Meyer, Matthias Bartelmann
E-Jahr:2017
Jahr:12 December 2017
Umfang:? S.
Fussnoten:Gesehen am 30.10.2018
Titel Quelle:Enthalten in: Journal of cosmology and astroparticle physics
Ort Quelle:London : IOP, 2003
Jahr Quelle:2017
Band/Heft Quelle:(2017), 12, Artikel-ID 025
ISSN Quelle:1475-7516
Abstract:We study the dynamical behaviour of gauge-invariant linear perturbations in spherically symmetric dust cosmologies including a cosmological constant. In contrast to spatially homogeneous FLRW models, the reduced degree of spatial symmetry causes a non-trivial dynamical coupling of gauge-invariant quantities already at first order perturbation theory and the strength and influence of this coupling on the spacetime evolution is investigated here. We present results on the underlying dynamical equations augmented by a cosmological constant and integrate them numerically. We also present a method to derive cosmologically relevant initial variables for this setup. Estimates of angular power spectra for each metric variable are computed and evaluated on the central observer's past null cone. By comparing the full evolution to the freely evolved initial profiles, the coupling strength will be determined for a best fit radially inhomogeneous patch obtained in previous works (see [1]). We find that coupling effects are not noticeable within the cosmic variance limit and can therefore safely be neglected for a relevant cosmological scenario. On the contrary, we find very strong coupling effects in a best fit spherical void model matching the distance redshift relation of SNe which is in accordance with previous findings using parametric void models.
DOI:doi:10.1088/1475-7516/2017/12/025
URL:Bitte beachten Sie: Dies ist ein Bibliographieeintrag. Ein Volltextzugriff für Mitglieder der Universität besteht hier nur, falls für die entsprechende Zeitschrift/den entsprechenden Sammelband ein Abonnement besteht oder es sich um einen OpenAccess-Titel handelt.

Volltext ; Verlag: http://dx.doi.org/10.1088/1475-7516/2017/12/025
 Volltext: http://stacks.iop.org/1475-7516/2017/i=12/a=025
 DOI: https://doi.org/10.1088/1475-7516/2017/12/025
Datenträger:Online-Ressource
Sprache:eng
K10plus-PPN:1582413177
Verknüpfungen:→ Zeitschrift

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