The velocity field and 3-D structure of the Universe
TL;DRAbstract
The velocity field of matter in the Universe is dominated by the Hubble expansion, and the 3-dimensional structure is characterized by sheets with high density of visible matter separated by large voids. A superposed large-scale streaming of the luminous matter is only poorly indicated because distance determinations independent of the Hubble law are too uncertain. Very accurate tracers of the distance (5%), the Type la Supernova, are available, but they have been too sparsely observed to be useful in this context. Detection with Gaia, followed by ground-based monitoring, can give distances for about 50000 supernovae up to 500 Mpc or z = 0.10. This will greatly enhance our knowledge of the structure and velocities of the Universe. The underlying dark matter and dark energy will emerge from obscurity.
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The velocity field of matter in the Universe is dominated by the Hubble expansion, and the 3-dimensional structure is characterized by sheets with high density of visible matter separated by large voids. A superposed large-scale streaming of the luminous matter is only poorly indicated because distance determinations independent of the Hubble law are too uncertain. Very accurate tracers of the distance (5%), the Type la Supernova, are available, but they have been too sparsely observed to be useful in this context. Detection with Gaia, followed by ground-based monitoring, can give distances for about 50000 supernovae up to 500 Mpc or z = 0.10. This will greatly enhance our knowledge of the structure and velocities of the Universe. The underlying dark matter and dark energy will emerge from obscurity.
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