Radiation-induced reversal of baryonic perturbations

Abstract

view Abstract Citations (1) References (23) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Radiation-induced Reversal of Baryonic Perturbations Zurek, W. H. Abstract In the context of the cold dark matter (CDM) cosmology it is natural to assume that the first generation of luminous objects formed at redshifts 30 <~ z <~ 100. On galactic scales, their distribution and, therefore, the distribution of luminosity was presumably approximately given by a "biased" density field. If the luminous input of these objects was significant (a fraction of the energetic content of the microwave background), radiative push could have moved the bulk of the baryons into the minima of the dark matter distribution, thus creating baryon-rich seeds for the structure on galactic and larger scales. Moreover, on the scales on which such reversal of baryonic perturbations happens, power in the combined (baryons + dark matter) spectrum of density perturbations would be smaller than in the CDM universe with the same normalization on the very large scales which are opaque and, therefore, immune to the effects of radiation. This suggests "destructive interference" between baryonic and dark matter density perturbations on galactic scales as an explanation for the apparent excess of power observed on the "great attractor" scales, when extrapolated from the estimates of the galaxy-galaxy correlations. Infrared background measurements by COBE should be able to verify-or rule out-this scenario, which, if correct, could also help reconcile the dynamically observed fl with the flatness of the universe favored by inflation. Publication: The Astrophysical Journal Pub Date: April 1991 DOI: 10.1086/169833 Bibcode: 1991ApJ...370..474Z Keywords: Baryons; Cosmic Rays; Dark Matter; Radiation Effects; Astronomical Models; Brightness Distribution; Cosmology; Transfer Functions; Astrophysics; COSMOLOGY; DARK MATTER full text sources ADS |