Electron-phonon interaction and superconductivity in metallic molecular hydrogen. II. Superconductivity under pressure

A detailed study of the electron-phonon interaction in the $Cmca$ phase of metallic hydrogen and of its implications in the superconducting properties is presented. A careful analysis of the role played by anisotropy and by the presence of superconducting multigaps allows to single out the peculiarities that drive superconductivity at very high temperature in this system.