[vorg]

> as the universe was forming, there were concentrations of dark matter. Standing sound waves of photons and baryons (ordinary matter) formed around these concentrations

You make it sound like "dark matter" is normal matter and the "ordinary matter" is the abnormal stuff, since ordinary matter formed afterwards and has more complex interactions in that it supplements gravitation with electromagnetism and what not. And of course there's far more dark matter than ordinary.