1987 Fiscal Year Final Research Report Summary
On the Origin and Evolution of the Large Scale Stucturein the Universe
| Project/Area Number |
61302012
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| Research Category |
Grant-in-Aid for Co-operative Research (A)
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| Allocation Type | Single-year Grants |
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| Research Field |
Astronomy
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| Research Institution | University of Tokyo |
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Principal Investigator |
IKEUCHI SATORU University of Tokyo, Associate Professor, 東京天文台, 助教授 (90025461)
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| Co-Investigator(Kenkyū-buntansha) |
TOMITA KENJI Hiroshima University, Associate Professor, 理論物理学研究所, 助教授 (90034610)
SATO KATSUHIKO University of Tokyo, Assoicate Professor, 理学部, 助教授 (00111914)
MATSUDA TAKUYA Kyoto University, Associate Professor, 工学部, 助教授 (20026206)
FUJIMOT Mitsuaki Nagoya University, Professor, 理学部, 教授 (70022580)
KODAIRA KEIICHI University of Tokyo, Professor, 東京天文台, 教授 (60012845)
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| Project Period (FY) |
1986 – 1987
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| Keywords | Large Scale Structure of the Universre / Galaxy Formation / Cosmic Background Radiation / Two-Point Correlation Function / Density Fluctuation / Callisionless Particles / 暗黒物質 |
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| Research Abstract |
1. The properties of denity fluctuations formed after the rapid expansion (inflation) and phase change in the early universe are examined by using the field theory. Generally, the sacle-free adiabatic fluctuation dominates but the isocurvature fluctuation in also excited under a special condition. This conclusion is obtained for general cases.
2. The growth of density perturbations is simulated by an N-body method in consideration of dark matter. It is shown that when a hot dark matter like neutrinos and a dold one like axions coexist, the hierarchical structures of the universe from dwarf galaxies through superclusters and voids of galaxies are naturally reproduced.
3. The interactions between baryons and photons give rise to the distortion of microwave cosmic background radiation. In comparison with observations of MBR at radio and infrared region, the amplitude and scale of density fluctuations are constrained.
4. Summing up the above we have made clear of the evolution of the universe from a very early time to the present epoch. Moreover, we have studied (1) the origin of "Great Attractor", (2) the quantification of the large scale structure of the universe by means of the percolation analysis, (3) the calculation o two-point correlation function of clusters of galaxies and (4) the distortion of the cosmic background radiation due to the explosions in the universe.
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