Abstract
The galaxy peculiar velocity field (velocity relative to the uniform Hubble law expansion) seems to have a large r.m.s. value, ā¼500 km sā1, and a large coherence length ā³=50 Mpc. It is difficult to account for this in the standard model inspired by inflation, where galaxies and clusters of galaxies grow by gravity out of initially adiabatic fluctuations in the distribution of mass now dominated by weakly interacting cold dark matter1,2. A model that does seem to work assumes that, at high redshift, mass was uniform and the baryon number was inhomogeneous, a stationary random process. This produces in the late Universe a baryon distribution with a power spectrum proportional to the initial value at short wavelength, a prominent peak in the spectrum at the matter-radiation Jeans length, and a sharp cutoff at longer wavelengths. Here I report how this spectrum normalized by the observed galaxy clustering can produce by gravity the large velocity field with large coherence length needed without excessively perturbing the microwave background.
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References
1. Vittorio, N., Juszkiewicz, R. & Davis, M. Nature 323, 132ā133 (1986). 2. Bond, J. R. Galaxy Distances and Deviations from Universal Expansion (eds Madore, B. F. & Tully, R. B.) 255ā263 (Reidel, Dordrecht, 1986). 3. Wilkinson, D. T. Science 232, 1517ā1522 (1986). 4. Sandage, A. R. Astrophys. J. 307, 1ā19 (1986). 5. Rubin, V. C., Ford, W. K., Thonnard, N., Roberts, M. S. & Graham, J. A. Astr. J. 81, 687ā737 (1976). 6. Collins, A., Joseph, R. D. & Robertson, N. A. Nature 320, 506ā508 (1986). 7. Burstein, D. et al. Galaxy Distances and Deviations from Universal Expansion (eds Madore, B. F. & Tully, R. B.) 123ā130 (Reidel, Dordrecht, 1986). 8. Frenk, C. S., White, S. D. M., Efstathiou, G. & Davis, M. Nature 317, 595ā597 (1985). 9. Peebles, P. J. E. The Early Universe (ed. Unruh, W. G.) (Reidel, Dordrecht, 1986). 10. Peebles, P. J. E. The Origin and Evolution of Galaxies (eds Jones, B. J. T. & Jones, J. E.) 143ā169 (Reidel, Dordrecht, 1983). 11. Peebles, P. J. E. Astrophys. J. 248, 885ā897 (1981). 12. Glutton-Brock, M. & Peebles, P. J. E. Astr. J. 86, 1115ā1119 (1981). 13. Davis, M. & Peebles, P. J. E. Astrophys. J. 267, 465ā482 (1983). 14. Peebles, P. J. E. Astrophys. J. (in the press).
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Peebles, P. Origin of the large-scale galaxy peculiar velocity field: a minimal isocurvature model. Nature 327, 210ā211 (1987). https://doi.org/10.1038/327210a0
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DOI: https://doi.org/10.1038/327210a0
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