Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 453, Issue 3, Pages 2364-2377Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stv1672
Keywords
cosmology: observations; dark energy; dark matter
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Funding
- National Research Foundation (South Africa)
- South African Square Kilometre Array project (SKA SA)
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We present a new algorithm that can reconstruct the full distributions of metric components within the class of spherically symmetric dust universes that may include a cosmological constant. The algorithm is capable of confronting this class of solutions with arbitrary data and opens a new observational window to determine the value of the cosmological constant. In this work, we use luminosity and age data to constrain the geometry of the Universe up to a redshift of z = 1.75. We show that, although current data are perfectly compatible with homogeneous models of the Universe, simple radially inhomogeneous void models that are sometimes used as alternative explanations for the apparent acceleration of the late-time Universe cannot yet be ruled out. In doing so, we reconstruct the density of cold dark matter out to z = 1.75 and derive constraints on the metric components when the Universe was 10.5 Gyr old within a comoving volume of approximately 1 Gpc(3).
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