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- W2150394162 abstract "First the adiabatic radiative perturbations associated with the neutrino perturbations of cluster size are compared with the upper limit of anisotropy of the cosmic background radi ation, and it is found that the scenario is worth noticing, in which galaxies first form from primordial entropy perturbations and later clusters of galaxies form by the clustering process. Next the nonlinear growth of entropy perturbations of galaxy size is numerically analyzed, and the amplitudes of the initial perturbations necessary for the formation of galaxies at the epochs z:<3 are derived. The growth in the Lemaitre universe also is examined. It is concluded that this scenario is possible. that the universe may be neutrino dominated and so dense to be closed, and that the mass problem may be solved. In this case the neutrinos play the role of the massive halo, which includes observationally unseen missing mass.3)-6) As for the formation of galaxies in the neutrino dominated universe the following conclusions have been derived so far. First the neutrino perturbations with mass Mv larger than the Jeans mass MJ are easy to grow gravitationally and also the perturbations in nucleon matter grow at the same time due to the attraction of the neutrino perturbations. The spatial size of the perturbations corresponds to clusters of galaxies or supergalaxies. Next, if Mv<MJ, the gravitational growth of density perturbations in nucleon matter in the neutrino dominated situation is extremely slow in the linearized treatment, as was shown by Bond et al.7) Sato and Takahara 8 ) proposed the theory in which the formation of galaxies was performed not individually, but only within the growing objects of cluster size owing to the fragmentation. However it will be shown in this paper that the adiabatic perturbations associated with the neutrino perturbations may be so large to contradict with the isotropy of the cosmic background radiation. A similar situation arises in the low density model with zero neutrino mass. 9 ),10) In this paper, moreover, it will be shown that the objects of galaxy size" @default.
- W2150394162 created "2016-06-24" @default.
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- W2150394162 date "1982-04-01" @default.
- W2150394162 modified "2023-09-25" @default.
- W2150394162 title "Galaxy Formation in the Neutrino Dominated Universe" @default.
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- W2150394162 doi "https://doi.org/10.1143/ptp.67.1093" @default.
- W2150394162 hasPublicationYear "1982" @default.
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