2024/07/27 by Zong-Fan Yang, Yang, Zong-Fan, Da-Wei Yao +3 · 2 citations
Physics and Astronomy · #Astronomy and Astrophysical Research #Cosmology and Gravitation Theories #Cosmology and Nongalactic Astrophysics (astro-ph.CO) #FOS: Physical sciences #Scientific Research and Discoveries
paper · pdf · doi:10.48550/arxiv.2407.19278
openalex publication_date 2024/07/27 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
If the Universe is endowed with cosmic anisotropy, it will have a preferred direction of expansion. Reconstructing the expansion history by Gaussian Process (GP) can be used to probe the cosmic anisotropy model-independently. In this paper, for the luminosity distance dL(z) reconstruction, we turn to the inverse distance ladder, where type Ia supernova (SNIa) from the Pantheon+ sample determine relative distances and strongly gravitationally lensed quasars from H0LiCOW sample anchor these relative distances with some absolute distance measurements. By isolating the anisotropic information that could be carried by the Hubble constant H0 and obtaining constraints on the intrinsic parameter of SNIa, the absolute magnitude M=-19.2522+0.0594-0.0649 (at 68% CL), we find that dL(z) reconstructions from samples located in different region of the Galactic coordinate system are almost consistent with each other, while only a very weak preference for the cosmic anisotropy is found.