Latest evidence for a late time vacuum–geodesic CDM interaction
Leiden Repository (Leiden University)
Abstract
We perform a reconstruction of the coupling function between vacuum energy and geodesic cold dark matter using the latest observational data. We bin the interaction in seventeen redshift bins but use a correlation prior to prevent rapid, unphysical oscillations in the coupling function. This prior also serves to eliminate any dependence of the reconstruction on the binning method. We use two different forms of the correlation prior, finding that both give similar results for the reconstruction of the dark matter -- dark energy interaction. Calculating the Bayes factor for each case, we find no meaningful evidence for deviation from the null interacting case, i.e. $\Lambda$CDM, in our reconstruction.
Authors 5
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Natalie B Hogg corresponding
Affiliation as printed
Institute of Cosmology and Gravitation, University of Portsmouth, Burnaby Road, Portsmouth PO1 3FX, United Kingdom
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Istituto Nazionale di Fisica Nucleare, Sezione di Trieste · University of Portsmouth
Affiliation as printed
INFN Sezione di Trieste, Via Valerio 2, 34127 Trieste, Italy
Institute of Cosmology and Gravitation, University of Portsmouth, Burnaby Road, Portsmouth PO1 3FX, United Kingdom
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Affiliation as printed
Institute of Cosmology and Gravitation, University of Portsmouth, Burnaby Road, Portsmouth PO1 3FX, United Kingdom
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Consejo Superior de Investigaciones Científicas · Instituto de Física Teórica · Universidad Autónoma de Madrid
Affiliation as printed
Instituto de Física Téorica UAM-CSIC, Campus de Cantoblanco, E-28049 Madrid, Spain
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Affiliation as printed
Institute Lorentz, Leiden University, PO Box 9506, Leiden 2300 RA, The Netherlands