Limits on the Global Hubble Constant and the Age of the Universe from the Local Hubble Constant Measurement
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概要
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While the recent discovery of the Cepheid variables in the Virgo cluster galaxies puts additional support for the Hubble constant H_080 km/sec/Mpc, a relatively lower value H_050 km/sec/Mpc is suggested by other distance indicators based on the Sunyaev-Zel'dovich effect and the gravitational lens which probe the universe at higher redshifts z=(0.1〜1). In order to reconcile the possible discrepancy between the estimates of the Hubble constants from nearby galaxy samples and high-redshift clusters, we consider a model of a locally open universe embedded in the spatially flat universe. We find analytic expressions for the lower limit on the global Hubble constant H_G, and the upper limit on the age of the universe with a given value for the Hubble constant H_L in the local universe. We conclude that it is quite unlikely that the above difference in the estimates of the Hubble constant, if real, is explained within the framework of the gravitational instability picture.
- 1995-04-25
著者
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Suto Yasushi
Department Of Physics School Of Science The University Of Tokyo
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Inagaki Yuichiro
Department Of Physics The University Of Tokyo
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Inagaki Yuichiro
Department Of Physics School Of Science The University Of Tokyo
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SUGINOHARA Tatsushi
Department of Physics, The University of Tokyo
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Suginohara T
Department Of Physics The University Of Tokyo
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SUTO Yasushi
Department of Physics and Research Center for the Early University School of Science, University of Tokyo
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INAGAKI Yuichiro
Department of Physics, The University of Tokyo
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