Cosmic background temperature anisotropy in a minimal isocurvature model for galaxy formation

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Anisotropy, Cosmology, Galactic Clusters, Galactic Evolution, Perturbation Theory, Stellar Mass, Baryons, Dark Matter, Monte Carlo Method, Radiation, Relativistic Particles, Universe

Scientific paper

If the dominant components of the universe were radiation and baryons, and the primeval baryon distribution had a roughly flat spectrum normalized to galaxy clustering on scales ≡20 Mpc, and young stars were able to keep the bulk of the matter ionized at redshifts z ⪆ 20, then several encouraging results would follow. The first generation that starts to form when Compton drag becomes unimportant would have masses and radii comparable to galaxies. Mass fluctuations on scales ≡200 Mpc could be relatively large and so perhaps favorable for development of large-scale structure. And the residual fluctuations in the background temperature would have a coherence length of 3°-5° and a standard deviation δT/T ≈ 10-5, close to but below the observational bounds.

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