"In the coming decade, the transient universe will be mapped out in great detail by the emerging wide-field multiwavelength surveys, neutrino and gravitational-wave detectors, promising to probe the astronomical and physical origin of the most extreme relativistic sources. This volume introduces the physical processes relevant to the source modeling of the transient universe. Ideal for graduate students and researchers in astrophysics, this book gives a unified treatment of electromagnetic, hadronic and gravitational radiation processes associated with relativistic outflows from compact objects. After introducing the source classes, the authors set out the various radiation processes associated with magneto-hydrodynamic flows, such as blast waves, winds, jets and accretion. Readers will gain an understanding of the theory, observations and some methods of data analysis for gravitational-wave data"--