12 citations · 18 across the 4 of their papers we have counts for
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astro-ph.CO2021
Large-scale structure with superhorizon isocurvature dark energy
Koki Yamashita, Yue Nan, Yuuki Sugiyama +1
The standard cosmological model assumes a homogeneous and isotropic universe as the background spacetime on large scales called the cosmological principle. However, some observatio…
astro-ph.CO2021
Dark energy model with very large-scale inhomogeneity
Yue Nan, Kazuhiro Yamamoto
We consider a dynamical model for dark energy based on an ultralight mass scalar field with very large-scale inhomogeneities. This model may cause observable impacts on the anisotr…
gr-qc2021
Entanglement of the Vacuum between Left, Right, Future, and Past: Dirac spinor in Rindler spaces and Kasner spaces
Kazushige Ueda, Atsushi Higuchi, Kazuhiro Yamamoto +2
We study the relations of the positive frequency mode functions of Dirac field in 4-dimensional Minkowski spacetime covered with Rindler and Kasner coordinates, and describe the ex…