Astronomy and Astrophysics – Astrophysics
Scientific paper
1994-12-21
Astronomy and Astrophysics
Astrophysics
9 pages, Latex file, 3 figures available by request
Scientific paper
10.1086/309601
Astrophysical observations indicate that the ``Local Universe" has a relatively lower matter density ($\Omega_0$) than the predictions of the standard inflation cosmology and the large-scale motions of galaxies which provide a mean mass density to be very close to unity. In such a local underdense region the Hubble expansion may not be representative of the global behaviour. Utilizing an underdense sphere embedded in a flat universe as the model of our ``Local Universe", we show that the local Hubble constant would be 1.2 -- 1.4 times larger than the global value on scale of $\sim80$ Mpc, depending on the variation of $\Omega_0$. This may account for the recent measurements of the unpleasantly large Hubble constant of $\sim$80 km/s/Mpc using the Cepheid variables in the Virgo cluster and the relative distance between Virgo and Coma cluster and removes the resulted apparent paradox of the age of our universe.
Deng Zugan
Fang Li-zhi
Qin Bo
Wu Xiang-Ping
Zou Zhenlong
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