https://doi.org/10.1140/epjc/s10052-023-12016-6
Regular Article - Theoretical Physics
Constraints on the local cosmic void from the Pantheon supernovae data
1
Institute of Theoretical Physics and Research Center of Gravitation, Lanzhou University, 730000, Lanzhou, China
2
Key Laboratory of Quantum Theory and Applications of MoE, Lanzhou University, 730000, Lanzhou, China
3
Lanzhou Center for Theoretical Physics and Key Laboratory of Theoretical Physics of Gansu Province, Lanzhou University, 730000, Lanzhou, China
4
School of Physical Science and Technology, Lanzhou University, 730000, Lanzhou, China
5
Instituto de Astrofísica e Ciências do Espaço, Universidade de Lisboa, 1769-016, Lisbon, Portugal
6
Université de Paris Cité, APC-Astroparticule et Cosmologie (UMR-CNRS 7164), 75006, Paris, France
Received:
27
April
2023
Accepted:
8
September
2023
Published online:
26
September
2023
In principle, the local cosmic void can be simply modeled by the spherically symmetric Lemaitre–Tolman–Bondi (LTB) metric. In practice, the real local cosmic void is probably not spherically symmetric. In this paper, to reconstruct a more realistic profile of the local cosmic void, we divide it into several segments. Each segment with certain solid angle is modeled by its own LTB metric. Meanwhile, we divide the 1048 type Ia supernovae (SNIa) of the Pantheon Survey into corresponding subsets according to their distribution in the galactic coordinate system. Obviously, each SNIa subset can only be used to reconstruct the profile of one segment. Finally, we can patch together an irregular profile for the local cosmic void with the whole Pantheon sample. Note that, the paucity of each data subset lead us to focus on the inner part of each void segment and assume that the half radii of the void segments are sufficient to constrain the whole segment. We find that, despite signals of anisotropy limited to the depth of the void segments, the constraints on every void segment are consistent with CDM model at 95% CL. Moreover, our constraints are too weak to challenge the cosmic homogeneity and isotropy.
© The Author(s) 2023
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