@article{VovchenkoBrandtCuterietal.2021,
  author    = {Volodymyr Vovchenko and Bastian Benjamin Brandt and Francesca Cuteri and Gergely Endrődi and Fazlollah Hajkarim and J{\"u}rgen Schaffner-Bielich},
  title     = {Pion condensation in the early universe at nonvanishing lepton flavor asymmetry and its gravitational wave signatures},
  journal   = {Physical review letters},
  volume    = {126},
  number    = {art. 012701},
  pages     = {1 -- 7},
  doi       = {10.1103/PhysRevLett.126.012701},
  year      = {2021},
}