Model-Independent Determination of H0 and ΩK0 from Strong Lensing and Type Ia Supernovae

Thomas Collett, Francesco Montanari, and Syksy Räsänen
Phys. Rev. Lett. 123, 231101 – Published 2 December 2019

Abstract

We present the first determination of the Hubble constant H0 from strong lensing time delay data and type Ia supernova luminosity distances that is independent of the cosmological model. We also determine the spatial curvature model independently. We assume that light propagation over long distances is described by the Friedmann-Lemaître-Robertson-Walker (FLRW) metric and geometrical optics holds, but make no assumption about the contents of the Universe or the theory of gravity on cosmological scales. We find H0=75.74.4+4.5km/s/Mpc and ΩK0=0.120.25+0.27. This is a 6% determination of H0. A weak prior from the cosmic microwave background on the distance to the last scattering surface improves this to H0=76.83.8+4.2km/s/Mpc and ΩK0=0.180.18+0.25. Assuming a zero spatial curvature, we get H0=74.22.9+3.0km/s/Mpc, a precision of 4%. The measurements also provide a consistency test of the FLRW metric: we find no evidence against it.

  • Figure
  • Received 23 May 2019
  • Revised 11 October 2019

DOI:https://doi.org/10.1103/PhysRevLett.123.231101

© 2019 American Physical Society

Physics Subject Headings (PhySH)

Gravitation, Cosmology & Astrophysics

Authors & Affiliations

Thomas Collett

  • Institute of Cosmology and Gravitation, University of Portsmouth, Dennis Sciama Building, Burnaby Road, Portsmouth, PO1 3FX, United Kingdom

Francesco Montanari

  • Instituto de Física Teórica IFT-UAM/CSIC, Universidad Autónoma de Madrid, Cantoblanco 28049 Madrid, Spain

Syksy Räsänen

  • University of Helsinki, Department of Physics and Helsinki Institute of Physics, P.O. Box 64, FIN-00014 University of Helsinki, Finland

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Issue

Vol. 123, Iss. 23 — 6 December 2019

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