A gigaparsec-scale local void and the Hubble tension
  We explore the possibility of using a gigaparsec-scale local void to
reconcile the Hubble tension. Such a gigaparsec-scale void can be produced by
multi-stream inflation where different parts of the observable universe follow
different inflationary trajectories. The impact of such a void for cosmological
observations is studied, especially those involving supernovae, Baryon Acoustic
Oscillations (BAO) and the kinetic Sunyaev-Zel'dovich (kSZ) effect. As a
benchmark model, a 1.7Gpc scale with boundary width 0.7Gpc and density contrast
-0.14 may ease the Hubble tension.
