Evidence for cosmic acceleration with next-generation surveys: a model-independent approach
- Bengaly, Carlos A P ORCID Département de Physique Théorique, Université de Genève, 24 quai Ernest Ansermet, CH-1211 Genéve 4, Switzerland
- 2020-3-13
Published in:
- Monthly Notices of the Royal Astronomical Society: Letters. - Oxford University Press (OUP). - 2020, vol. 499, no. 1, p. L6-L10
English
ABSTRACT
We quantify the evidence for cosmic acceleration using simulations of H(z) measurements from SKA- and Euclid-like surveys. We perform a non-parametric reconstruction of the Hubble parameters and its derivative to obtain the deceleration parameter q(z) using the Gaussian Processes method. This is a completely model-independent approach, so we can determine whether the Universe is undergoing accelerated expansion regardless of any assumption of a dark energy model. We find that Euclid-like and SKA-like band 1 surveys can probe cosmic acceleration at over 3 and 5σ confidence level, respectively. By combining them with an SKA-like band 2 survey, which reaches lower redshift ranges, the evidence for a current accelerated phase increases to over 7σ. This is a significant improvement from current H(z) measurements from cosmic chronometers and galaxy redshift surveys, showing that these surveys can underpin cosmic acceleration in a model-independent way.
- Language
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- English
- Open access status
- green
- Identifiers
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- DOI 10.1093/mnrasl/slaa040
- ISSN 1745-3925
- Persistent URL
- https://sonar.ch/global/documents/170953
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