Matter Fields (IMAGE)
Caption
Matter fields at the moment of cloud collapse (i.e. onset of star formation) as projected distributions of dark matter (top) and gas (bottom) in four simulations targeted at the same region but with different abundances of primordial black holes, measured by the parameter f_PBH. Primordial black holes are plotted with black dots and the circles show the size of the structure that hosts the collapsing cloud. The data slice has a physical extent of 2000 light years and a thickness of 1000 light years. The age of the universe at the moment of collapse first decreases with f_PBH for f_PBH<0.001 when the "seeding" effect dominates. Then it increases from f_PBH=0.001 to f_PBH=0.01 and above as the "heating" effect becomes more important.
Credit
Liu et al.
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