Gauging the cosmic acceleration with recent type Ia supernovae data sets

Hermano Velten, Syrios Gomes, and Vinicius C. Busti
Phys. Rev. D 97, 083516 – Published 23 April 2018

Abstract

We revisit a model-independent estimator for cosmic acceleration based on type Ia supernovae distance measurements. This approach does not rely on any specific theory for gravity, energy content, nor parametrization for the scale factor or deceleration parameter and is based on falsifying the null hypothesis that the Universe never expanded in an accelerated way. By generating mock catalogs of known cosmologies, we test the robustness of this estimator, establishing its limits of applicability. We detail the pros and cons of such an approach. For example, we find that there are specific counterexamples in which the estimator wrongly provides evidence against acceleration in accelerating cosmologies. The dependence of the estimator on the H0 value is also discussed. Finally, we update the evidence for acceleration using the recent UNION2.1 and Joint Light-Curve Analysis samples. Contrary to recent claims, available data strongly favor an accelerated expansion of the Universe in complete agreement with the standard ΛCDM model.

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  • Received 8 January 2018

DOI:https://doi.org/10.1103/PhysRevD.97.083516

© 2018 American Physical Society

Physics Subject Headings (PhySH)

Gravitation, Cosmology & Astrophysics

Authors & Affiliations

Hermano Velten* and Syrios Gomes

  • Núcleo Cosmo-ufes and Departamento de Física, CCE, Universidade Federal do Espírito Santo, 29075-910 Vitória-ES, Brazil

Vinicius C. Busti

  • Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA and Departamento de Física Matemática, Instituto de Física, Universidade de São Paulo, 05508-090 São Paulo-SP, Brazil

  • *velten@pq.cnpq.br
  • syriosgs@gmail.com
  • busti@sas.upenn.edu

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Issue

Vol. 97, Iss. 8 — 15 April 2018

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