A Gigaparsec-scale Local Void and Cosmological Principle


In this talk, I will introduce the inconsistency between the cosmological principle and observations. In reconciling the inconsistency, we propose that the Milky Way could live inside a Gpc-scale local void that forms from the multi-stream inflation, and the existence of a Gpc-scale local void could ease the Hubble tension and explain the cosmic dipole. In this scenario, the Universe is homogeneous and isotropic, but with a number of voids embedded.