Journal
ASTROPHYSICAL JOURNAL LETTERS
Volume 886, Issue 1, Pages -Publisher
IOP Publishing Ltd
DOI: 10.3847/2041-8213/ab5308
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Funding
- National Natural Science Foundation of China (NSFC) [11603015]
- Fundamental Research Funds for the Central Universities [WUT:2018IB012]
- Korea Institute for Advanced Study (KIAS) - Korea government
- Energetic Cosmos Laboratory
- U.S. Department of Energy, Office of Science, Office of High Energy Physics [DE-SC-0007867, DE-AC02-05CH11231]
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Strongly lensed quasar systems with time delay measurements provide ?time delay distances,? which are a combination of three angular diameter distances and serve as powerful tools to determine the Hubble constant H-0. However, current results often rely on the assumption of the ?CDM model. Here we use a model-independent method based on Gaussian process to directly constrain the value of H-0. By using Gaussian process regression, we can generate posterior samples of unanchored supernova distances independent of any cosmological model and anchor them with strong lens systems. The combination of a supernova sample with large statistics but no sensitivity to H-0 with a strong lens sample with small statistics but H-0 sensitivity gives a precise H-0 measurement without the assumption of any cosmological model. We use four well-analyzed lensing systems from the state-of-art lensing program H0LiCOW and the Pantheon supernova compilation in our analysis. Assuming the universe is flat, we derive the constraint H(0)72.2;2.1 km s(?1) Mpc(?1), a precision of 2.9%. Allowing for cosmic curvature with a prior of ?[?0.2, 0.2], the constraint becomes H 73.0+ km s- Mpc(-1).
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