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gr-qc1997
Hamiltonians for Compact Homogeneous Universes
Masayuki Tanimoto, Tatsuhiko Koike, Akio Hosoya
We briefly show how we can obtain Hamiltonians for spatially compact locally homogeneous vacuum spacetimes. The dynamical variables are categorized into the curvature parameters an…
gr-qc1993
Causal Feature of Central Singularity and Gravitational Mass
Tatsuhiko Koike, Hisashi Onozawa, Masaru Siino
Mass of singularity is defined, and its relation to whether the singularity is spacelike, timelike or null is discussed for spherically symmetric spacetimes. It is shown that if th…