Consequences of Accretion onto Primordial Compact Objects

Physics

Scientific paper

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Scientific paper

Many lines of evidence suggest that nonbaryonic dark matter constitutes roughly 30 percent of the critical closure density, but the composition of this dark matter is unknown. One class of candidates for the dark matter is stellar-mass compact objects formed in the early universe. Specific candidates of this type include black holes formed at the epoch of the QCD phase transition, quark stars, and boson stars. We explore the effects of accretion onto these objects, and show that the resulting radiation may have significant effects on ionization (and hence on the observed CMB power spectrum) and on early structure formation. Observations of radiation from high redshifts can therefore be used to constrain the contribution of primordial compact objects to dark matter.

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