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Can a void mimic the $\Lambda$ in $\Lambda$CDM?

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arxiv 1503.08045 v2 pith:PQA4OKKT submitted 2015-03-27 astro-ph.CO gr-qc

classification astro-ph.COgr-qc
keywords lambdamodelmodelstimeobservationsredshiftbangearly
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abstract

We investigate Lema\^itre-Tolman-Bondi (LTB) models, whose early time evolution and bang time are homogeneous and the distance - redshift relation and local Hubble parameter are inherited from the $\Lambda$CDM model. We show that the obtained LTB models and the $\Lambda$CDM model predict different relative local expansion rates and that the Hubble functions of the models diverge increasingly with redshift. The LTB models show tension between low redshift baryon acoustic oscillation and supernova observations and including Lyman-$\alpha$ forest or cosmic microwave background observations only accentuates the better fit of the $\Lambda$CDM model compared to the LTB model. The result indicates that additional degrees of freedom are needed to explain the observations, for example by renouncing spherical symmetry, homogeneous bang time, negligible effects of pressure, or the early time homogeneity assumption.

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Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Alleviating the Hubble Tension with a Local Void and Transitions of the Absolute Magnitude

    astro-ph.CO 2025-04 conditional novelty 5.0 of 10

    Deep LTB void models with two or three distance-dependent jumps in the supernova absolute magnitude fit Pantheon+ and Planck data well and push the inferred local Hubble constant toward the SH0ES value.

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