Astronomy and Astrophysics – Astrophysics
Scientific paper
1993-05-14
Astronomy and Astrophysics
Astrophysics
23 pages, tex, 1 figure can be obtaine from tsvi@cfata4.harvard.edu CFA-3640
Scientific paper
We suggest to use the common appearance of voids with a scale of $5000 \kms$ in the galaxy distribution to estimate the power spectrum on this scale. We use a simple model for a gravitational formation of voids and we compare the results with the matter fluctuations as constrained by the CMBR observations of COBE. We find that a power spectrum $P(k)\propto k^n$ with $n \approx 1.25$ is compatible both with COBE and with gravitational growth of large voids in an $\Omega=1$ universe. A Harrison-Zel'dovich spectrum, $n=1$, normalized to produce the observed CMBR fluctuations, does not have enough power for gravitational growth of voids with a diameter of $5000 \kms$ in an $\Omega=1$ Universe. Such a spectrum would be compatible if (i) void diameters are smaller ($3500 \kms$), the voids are shallower or if the voids are rare (we assume that the universe is void filled); (ii) $\Omega < 1$ i.e. the Universe is open; (iii) galaxies do not trace matter on very large scale or if (iv) the voids do not grow gravitationally.
Blumenthal George R.
da Costa Luiz Nicolaci
Goldwirth Dalia S.
Lecar Myron
Piran Tsvi
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