2009

Spherical collapse in quintessence models with zero speed of sound

Creminelli, Paolo, D'Amico, Guido, Noreña, Jorge et al.

Understand

We study the spherical collapse model in the presence of quintessence with negligible speed of sound.

This case is particularly motivated for w<-1 as it is required by stability.
As pressure gradients are negligible, quintessence follows dark matter during the collapse.
The spherical overdensity behaves as a separate closed FLRW universe, so that its evolution can be studied exactly.

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