An SIDM simulation of the merging cluster El Gordo and its tension between the post collision DM density profiles and weak lensing constraintsR. Valdarninihttps://arxiv.org/abs/2509.01298
An SIDM simulation of the merging cluster El Gordo and its tension between the post collision DM density profiles and weak lensing constraintsWe review recent findings from a detailed simulation study of the merging cluster El Gordo and present new results inferred from weak lensing data. We found that the observed spatial offsets between the different mass components are well reproduced in merging simulations that include self-interacting dark matter (DM), with an elastic cross-section per unit mass of approximately σ_DM/m_X ~ 4 -5 cm^2/gr. Moreover, a relative line-of-sight peculiar velocity on the order of several hundred km/s is…