# Dynamical evolutin of quintessence dark energy in collapsing dark matter halos - Astrophysics > Cosmology and Nongalactic Astrophysics

Abstract: In this paper, we analyze the dynamical evolution of quintessence dark energyinduced by the collapse of dark matter halos. Different from other previousstudies, we develop a numerical strategy which allows us to calculate the darkenergy evolution for the entire history of the spherical collapse of darkmatter halos, without the need of separate treatments for linear, quasi-linearand nonlinear stages of the halo formation. It is found that the dark energyperturbations evolve with redshifts, and their specific behaviors depend on thequintessence potential as well as the collapsing process. The overall energydensity perturbation is at the level of $10^{-6}$ for cluster-sized halos. Theperturbation amplitude decreases with the decrease of the halo mass. At a givenredshift, the dark energy perturbation changes with the radius to the halocenter, and can be either positive or negative depending on the contrast of$\partial t \phi$, $\partial r \phi$ and $\phi$ with respect to the background,where $\phi$ is the quintessence field. For shells where the contrast of$\partial r \phi$ is dominant, the dark energy perturbation is positive and canbe as high as about $10^{-5}$.

Author: Qiao Wang, Zuhui Fan

Source: https://arxiv.org/