49 citations · 269 across the 19 of their papers we have counts for
19 papers
The Role of Anisotropy in the Void Models without Dark Energy
Masayuki Tanimoto, Yasusada Nambu, Kazuhiro Iwata
Void models provide a possible explanation of the "accelerated expansion" of the Universe without dark energy. To make the conventional void models more realistic, we allow the voi…
Luminosity distance-redshift relation for the LTB solution near the center
Masayuki Tanimoto, Yasusada Nambu
Motivated by the inverse problem for the Lemaitre-Tolman-Bondi dust solution, in which problem the luminosity distance function is taken as an input to select a specific m…
Accelerating Universe via Spatial Averaging
Yasusada Nambu, Masayuki Tanimoto
We present a model of an inhomogeneous universe that leads to accelerated expansion after taking spatial averaging. The model universe is the Tolman-Bondi solution of the Einstein…
Harmonic Analysis of Linear Fields on the Nilgeometric Cosmological Model
Masayuki Tanimoto
To analyze linear field equations on a locally homogeneous spacetime by means of separation of variables, it is necessary to set up appropriate harmonics according to its symmetry…
Linear perturbations of spatially locally homogeneous spacetimes
Masayuki Tanimoto
Methods and properties regarding the linear perturbations are discussed for some spatially closed (vacuum) solutions of Einstein's equation. The main focus is on two kinds of spati…
Perturbations of Spatially Closed Bianchi III Spacetimes
Masayuki Tanimoto, Vincent Moncrief, Katsuhito Yasuno
Motivated by the recent interest in dynamical properties of topologically nontrivial spacetimes, we study linear perturbations of spatially closed Bianchi III vacuum spacetimes, wh…