Towards Exascale Computing for Astrophysical Simulation Leveraging the Leonardo EuroHPC System. - Nitin Shukla; Alessandro Romeo; Caterina Caravita; Michael Redenti; Radim Vavrík; Lubomir Riha; Andrea Mignone; Marco Rossazza; Stefano Truzzi; Luca Tornatore; Antonio Ragagnin; Tiago Castro; et al. (CoRR, 2025)