Lemos, P;
Lee, E;
Efstathiou, G;
Gratton, S;
(2019)
Model independent H(z) reconstruction using the cosmic inverse distance ladder.
Monthly Notices of the Royal Astronomical Society
, 483
(4)
pp. 4803-4810.
10.1093/mnras/sty3082.
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Abstract
Recent distance ladder determinations of the Hubble constant H0 disagree at about the 3.5σ level with the value determined from Planck measurements of the cosmic microwave background (CMB) assuming a ΛCDM1 cosmology. This discrepancy has prompted speculation that new physics might be required beyond that assumed in the ΛCDM model. In this paper, we apply the inverse distance ladder to fit a parametric form of H(z) to baryon acoustic oscillation (BAO) and Type Ia supernova (SNe) data together with priors on the sound horizon at the end of the radiation drag epoch, rd. We apply priors on rd, based on inferences from either Planck or the Wilkinson Microwave Anisotropy Probe (WMAP), and demonstrate that these values are consistent with CMB-independent determination of rd derived from measurements of the primordial deuterium abundance, BAO, and supernova data assuming the ΛCDM cosmology. The H(z) constraints that we derive are independent of detailed physics within the dark sector at low redshifts, relying only on the validity of the Friedmann–Robertson–Walker metric of General Relativity. For each assumed prior on rd, we find consistency with the inferred value of H0 and the Planck ΛCDM value and corresponding tension with the distance ladder estimate.
| Type: | Article |
|---|---|
| Title: | Model independent H(z) reconstruction using the cosmic inverse distance ladder |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1093/mnras/sty3082 |
| Publisher version: | https://doi.org/10.1093/mnras/sty3082 |
| Language: | English |
| Additional information: | This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | cosmology: observations – distance scale – cosmological parameters – largescale structure of Universe. |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10071219 |
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