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In the mirror world hypothesis the mirror baryonic component emerges as apossible dark matter candidate. An immediate question arises: how the mirrorbaryons behave and what are the differences from the more familiar dark mattercandidates as e.g. cold dark matter? In this paper we answer quantitatively tothis question. First we discuss the dependence of the relevant scales for thestructure formation (Jeans and Silk scales) on the two macroscopic parametersnecessary to define the model: the temperature of the mirror plasma (limited bythe Big Bang Nucleosynthesis) and the amount of mirror baryonic matter. Then weperform a complete quantitative calculation of the implications of mirror darkmatter on the cosmic microwave background and large scale structure powerspectrum. Finally, confronting with the present observational data, we obtainsome bounds on the mirror parameter space.Comment: 11 pages, 6 figures; minor corrections, references added; accepted  for publication in IJMP

STRUCTURE FORMATION WITH MIRROR DARK MATTER: CMB AND LSS