Structure Formation with Mirror Dark Matter: CMB and LSS
Abstract
In the mirror world hypothesis the mirror baryonic component emerges as a possible dark matter candidate. An immediate question arises: how the mirror baryons behave and what are the differences from the more familiar dark matter candidate, the cold dark matter (CDM)? In this paper we quantitatively answer this question and describe the implications on CMB and LSS. We need only two extra thermodynamical parameters to describe our model: the temperature of the mirror plasma(limited by the BBN) and the amount of mirror baryonic matter. We show as specific signatures on the evolution of the perturbations are related to the decoupling time and the dissipative Silk scale of the mirror baryons. Confronting with the present observational data, we also obtain some bounds on the mirror parameter space.Keywords
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