期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 448, 期 4, 页码 3463-3471出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stv261
关键词
cosmology: observations; distance scale; large-scale structure of Universe
资金
- European Research Council under the European Community [FP7-IDEAS-Phys.LSS 240117]
- Mineco [FPA2011-29678-C02-02]
- Alfred P. Sloan Foundation
- National Science Foundation
- US Department of Energy Office of Science
- ESA Member States
- NASA
- ICREA Funding Source: Custom
We exploit cosmological model-independent measurements of the expansion history of the Universe to provide a cosmic distance ladder. These are supernovae Type Ia used as standard candles (at redshift between 0.01 and 1.3) and baryon acoustic oscillations (at redshifts between 0.1 and 0.8) as standard rulers. We calibrate (anchor) the ladder in two ways: first using the local H-0 value as an anchor at z = 0 (effectively calibrating the standard candles) and secondly using the cosmic microwave background-inferred sound-horizon scale as an anchor (giving the standard ruler length) as an inverse distance ladder. Both methods are consistent, but the uncertainty in the expansion history H(z) is smaller if the sound-horizon scale is used. We present inferred values for the sound horizon at radiation drag r(d) which do not rely on assumptions about the early expansion history nor on cosmic microwave background measurements but on the cosmic distance ladder and baryon acoustic oscillations measurements. We also present derived values of H-0 from the inverse distance ladder and we show that they are in very good agreement with the extrapolated value in a Lambda cold dark matter model from Planck cosmic microwave background data.
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