Phase space dynamics after the breaking of a relativistic Langmuir wave in a thermal plasma Anna Grassi, Luca Fedeli, Andrea Macchi, Sergei V. Bulanov and Francesco Pegoraro Eur. Phys. J. D, 68 6 (2014) 178 Published online: 27 June 2014 DOI: 10.1140/epjd/e2014-50153-0