The Universe was simply different when it was younger.
And you have to do it without raising the temperature of the material, because warmer material will prevent itself from collapsing. So you need some method of removing heat from material as it collapses very quickly.
Earlier simulations had found the appearance of dense pockets within early galaxies that cool off rapidly from emitting radiation, but did not have the resolution needed to follow their further evolution. These simulations revealed that large flows of cold, dense matter can strike an accretion disk at the center of giant clumps of matter. When that happens, a shockwave forms. That shockwave rapidly destabilizes the gas and triggers the instant collapse of large pockets of matter.
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