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• W3105328072 abstract "We study the distances and gravitational lensing in spherically symmetric inhomogeneous cosmological models consisting of inner and outer homogeneous regions that are connected by a single shell or double shells at redshift z1 ~ 0.067. The density and Hubble parameters in the inner region are assumed to be smaller and larger, respectively, than those in the outer region. It is found that at the stage z1 < z < 1.5 the distances from an observer in the inner voidlike region are larger than the counterparts (with equal z) in the corresponding homogeneous Friedmann models, and hence the magnitudes for the sources at this stage are larger. This effect of the voidlike low-density region may explain the deviations of the observed (magnitude-redshift) relation of supernovae (SNe) Ia from the relation in homogeneous models, independently of the cosmological constant. When the position of the observer deviates from the center, moreover, it is shown that the distances are anisotropic, and the images of remote sources are systematically deformed. The above relation at z ≳ 1.0, and this anisotropy will observationally distinguish the role of the above voidlike region from that of the positive cosmological constant. The influence on the time delay measurement is also discussed." @default.
• W3105328072 created "2020-11-23" @default.
• W3105328072 creator A5017413290 @default.
• W3105328072 date "2000-01-20" @default.
• W3105328072 modified "2023-09-27" @default.
• W3105328072 title "Distances and Lensing in Cosmological Void Models" @default.
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• W3105328072 doi "https://doi.org/10.1086/308277" @default.
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