Publication Date:
2019
Description:
〈p〉The local expansion rate of the Universe is parametrized by the Hubble constant, 〈f〉〈/f〉, the ratio between recession velocity and distance. Different techniques lead to inconsistent estimates of 〈f〉〈/f〉. Observations of Type Ia supernovae (SNe) can be used to measure 〈f〉〈/f〉, but this requires an external calibrator to convert relative distances to absolute ones. We use the angular diameter distance to strong gravitational lenses as a suitable calibrator, which is only weakly sensitive to cosmological assumptions. We determine the angular diameter distances to two gravitational lenses, 〈f〉〈/f〉 and 〈f〉〈/f〉 megaparsec, at redshifts 〈f〉〈/f〉 and 〈f〉〈/f〉. Using these absolute distances to calibrate 740 previously measured relative distances to SNe, we measure the Hubble constant to be 〈f〉〈/f〉 kilometers per second per megaparsec.〈/p〉
Print ISSN:
0036-8075
Electronic ISSN:
1095-9203
Topics:
Biology
,
Chemistry and Pharmacology
,
Computer Science
,
Medicine
,
Natural Sciences in General
,
Physics
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