Regular Article - Theoretical Physics
Probing cosmic opacity with the type Ia supernovae and Hubble parameter
School of Electrical and Electronic Engineering, Anhui Science and Technology University, 233030, Bengbu, Anhui, China
2 Department of Physics, Anhui Normal University, 241000, Wuhu, Anhui, China
3 School of Physics and Electronic Science, Zunyi Normal University, 563006, Zunyi, Guizhou, China
Accepted: 1 September 2020
Published online: 9 September 2020
In this paper, we probe the cosmic opacity with the newest Pantheon type Ia supernovae (SNIa) and the observational Hubble parameter data based on the CDM and wCDM models with or without spatial curvature. In the analysis, we marginalize the likelihood function of SNIa data over the pertinent nuisance parameter , a combination of the absolute magnitude of SNIa and the Hubble constant , with a flat prior. Two parameterizations of the optical depth associated to the cosmic absorption, namely and , are adopted. We find that the results are not sensitive to the fiducial cosmological models, the spatial curvature and parameterizations of . Moreover, the results from the Pantheon data alone are consistent with a transparent universe (). And once the H(z) data is combined, falls within the 68% confidence level (CL) of the best fit when a flat prior or the distance priors are used, while it falls within the 95% CL when a Gaussian distribution prior of km is used.
© The Author(s) 2020
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