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@ARTICLE{Cataldi:644922,
      author       = {Cataldi, Martina and Müürsepp, Kristjan and
                      Vanvlasselaer, Miguel},
      title        = {{CP}-violation in production of heavy neutrinos from bubble
                      collisions},
      reportid     = {PUBDB-2026-00465, arXiv:2506.12123. DESY-25-082},
      year         = {2026},
      note         = {34 pages, 8 figures; matches published JHEP version},
      abstract     = {First order phase transitions (FOPT) in the early Universe
                      can be powerful emitters of both relativistic and heavy
                      particles, upon the collision of ultra-relativistic bubble
                      shells. If the particles coupling to the bubble wall have
                      CP-violating interactions, the same collision process can
                      also create a local lepton or baryon charge. This
                      CP-violation can originate from different channels, which
                      have only been partially addressed in the literature. We
                      present a systematic analysis of the different channels
                      inducing CP-violation during bubble collisions: 1) the decay
                      of heavy particles 2) the production of heavy particles and
                      3) the production of light and relativistic Standard Model
                      (SM) particles.As an illustration of the impact that such
                      mechanisms can have on baryon number and dark matter (DM)
                      abundance, we then introduce a simple model of cogenesis,
                      separating a positive and a negative lepton number in the SM
                      and a dark sector. The lepton number asymmetry in the SM can
                      be used to explain the baryon asymmetry of the Universe
                      (BAU), while the opposite asymmetry in the dark sector is
                      responsible for determining the abundance of DM. Moreover,
                      the masses of light neutrinos can be understood via the
                      inverse seesaw mechanism, with the lepton-violating Majorana
                      mass originating from the FOPT.A typical signal produced by
                      a FOPT is the irreducible gravitational wave (GW)
                      background. We find that a substantial portion of the
                      parameter space can be probed at future observatories like
                      the Einstein Telescope (ET).},
      keywords     = {Baryo-and Leptogenesis (autogen) / Cosmology of Theories
                      BSM (autogen) / Early Universe Particle Physics (autogen) /
                      Phase Transitions in the Early Universe (autogen)},
      cin          = {UNI/TH},
      ddc          = {530},
      cid          = {$I:(DE-H253)UNI_TH-20120731$},
      pnm          = {611 - Fundamental Particles and Forces (POF4-611) / DFG
                      project G:(GEPRIS)390833306 - EXC 2121: Das Quantisierte
                      Universum II (390833306)},
      pid          = {G:(DE-HGF)POF4-611 / G:(GEPRIS)390833306},
      experiment   = {EXP:(DE-MLZ)NOSPEC-20140101},
      typ          = {PUB:(DE-HGF)25},
      eprint       = {2506.12123},
      howpublished = {arXiv:2506.12123},
      archivePrefix = {arXiv},
      SLACcitation = {$\%\%CITATION$ = $arXiv:2506.12123;\%\%$},
      doi          = {10.3204/PUBDB-2026-00465},
      url          = {https://bib-pubdb1.desy.de/record/644922},
}