Constrained simulation which reflects the local matter distribution in the Universe out to distances of several hundreds of Mpc are useful for localizing extragalactic multi-messenger sources in the known elements of the Large Scale Structure (LSS) of the Universe and understanding of propagation of the multi-messenger signals through the LSS. SLOW is a newly accomplished “constrained” simulation of the LSS in which known elements of the LSS (like galaxies and galaxy clusters are correctly reproduced and localized in the three-dimensional volume.
Apart from directly observed LSS elements, the simulation also infers physical quantities like magnetic field strength that affect propagation of the multi-messenger signals (UHECR, gamma-rays). VA to these data will be set up and maintained through the Cosmic Web Portal platform, together with data analysis service allowing to extract all necessary information needed to model the propagation and modulation of the multi messenger signal between the sources and the observer.