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Prog. Theor. Phys. Vol. 73 No. 5 (1985) pp. 1151-1164
Dynamical Evolution of Isothermal Density Perturbations in the Early Universe
Yasushi Suto,
Katsuhiko Sato and
Hideo Kodama
Department of Physics, The University of Tokyo, Tokyo 113
(Received December 17, 1984)
Abstract:
Quantitative behaviour of evolution of the initially isothermal perturbations is investigated numerically. It is shown that baryon density contrast decreases slowly in a radiation-dominated epoch, while radiation density perturbation grows in proportion to the scale factor. As a result, contrary to the common understanding, a significant anisotropy on the microwave background is produced. Quantitative results obtained by the numerical analysis make it possible to derive the ratio of the amplitude of baryon irregularities to that of radiation at the time of recombination. Combining it with the observed upper bound on the anisotropy of the cosmic background radiation, we obtain a severe constraint on the amplitude of initially isothermal fluctuations. The resultant constraint casts a serious problem on the theories of galaxy formation based on the isothermal perturbations.
URL :
http://ptp.ipap.jp/link?PTP/73/1151/
DOI : 10.1143/PTP.73.1151
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Citing Article(s) :
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Progress of Theoretical Physics Vol. 73 No. 3 (1985) pp. 674-682
:
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Generation and Evolution of the Density Fluctuation in the Evolving Universe. II
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Hideo Kodama
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Progress of Theoretical Physics Vol. 76 No. 5 (1986) pp. 1016-1035
:
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Evolution of Gauge-Invariant Cosmological Density Perturbations through Decoupling Era
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Naoteru Gouda and Misao Sasaki
