Kavli Affiliate: Ke Wang
| First 5 Authors: Zong-Fan Yang, Da-Wei Yao, Ke Wang, ,
| Summary:
The Universe with the cosmic anisotropy will have a preferred direction of
expansion. Therefore, 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 $d_L(z)$ reconstruction, we turn to the
inverse distance ladder where the type Ia supernova (SNIa) from the Pantheon+
sample determine the relative distances and the strongly gravitationally lensed
quasars from H0LiCOW sample anchor these relative distances with some absolute
distance measurements. By isolating the anisotropic information maybe carried
by the Hubble constant $H_0$ and obtaining the constraint on the intrinsic
parameter of SNIa, the absolute magnitude $M=-19.2522^{+0.0270}_{-0.0279}$ (at
$68%$ CL), we find that $d_L(z)$ reconstructions from samples located in
different region of the Galactic coordinate system are almost consistent with
each other and only a very weak preference for the cosmic anisotropy is found.
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