Abstract Details

Name: Jasjeet Bagla
Affiliation: IISER Mohali
Conference ID: ASI2020_382
Title : Dark Energy Perturbations in Non-Linear Collapse
Authors and Co-Authors : J S Bagla, Manvendra Pratap Rajvanshi
Abstract Type : Invited
Abstract Category : General Relativity and Cosmology
Abstract : We study evolution of dark energy and dark matter perturbations for spherically symmetric initial conditions. This is done using numerical solutions of Einstein equations. We find that dark energy perturbations remain small at all scales and at all times. The equation of state parameter becomes a function of space and is correlated with the dark matter density contrast. We compare evolution of perturbations in different classes of dark energy models for the same expansion history and we find that dark energy perturbations carry a signature of the model. However this signature is significant only if the equation of state parameter differs significantly from (-1). There is no discernible impact on evolution of dark matter perturbations.