The injection and feedback of Cosmic Rays in large-scale structures

We present the numerical implementation of run-time injection of Cosmic Rays energy, their spatial advection and their dynamical feedack on baryonic gas in the cosmological grid code ENZO. We discuss the results of its application to large-scale simulations showing that the CR energy inside clusters of galaxies is small compared to the gas energy (less than a few percent), while the ratio is larger near the accretion regions of clusters and filaments (about 0.1-0.3). CR feedback has a small, but significant impact on the X-ray emission and Sunyaev-Zeldovich effect from clusters.