Profiles of the particle fractions Yi ≡ ni/nB (upper plots) and baryon mass density ρB (lower plots) for the collapse of a 40 M⊙ star, where ni represents the number density of particle i, and nB the baryon mass number density. For the upper plots of all panels, dotted, dot-dashed, long-dashed, short-dashed, and solid lines correspond to neutron, proton, u quark, d quark, and s quark, respectively. The panels in the top row are for the case with B = 90 MeV fm-3, and left, central, and right plots, respectively, show the profiles at 0 ms, 100 ms, and 142.19 ms after the bounce. The panels in the bottom row are for the case with B = 250 MeV fm-3, and left, central, and right plots, respectively, show the profiles at 0 ms, 1085.45 ms, and 1085.52 ms after the bounce. We note that, the upper-right and lower-right panels correspond to the moment of black hole formation for each case, and thin dotted vertical lines show the location of the apparent horizon.
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