• Scattering amplitudes of massive Nambu-Goldstone bosons 

      Brauner, Tomas; Jakobsen, Martin Fonnum (Journal article; Peer reviewed, 2018)
      Massive Nambu-Goldstone (mNG) bosons are quasiparticles the gap of which is determined exactly by symmetry. They appear whenever a symmetry is broken spontaneously in the ground state of a quantum many-body system and at ...