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@ARTICLE{Dorsch:643046,
      author       = {Dorsch, Gláuber C. and Konstandin, Thomas and Perboni,
                      Enrico and Pinto, Daniel A.},
      title        = {{N}on-singular solutions to the {B}oltzmann equation with a
                      fluid {A}nsatz},
      journal      = {Journal of cosmology and astroparticle physics},
      volume       = {04},
      number       = {04},
      issn         = {1475-7508},
      address      = {London},
      publisher    = {IOP},
      reportid     = {PUBDB-2025-05795, arXiv:2412.09266. DESY-24-193},
      pages        = {033 -},
      year         = {2025},
      note         = {33 pages, 20 figures},
      abstract     = {Cosmological phase transitionscan give rise to intriguing
                      phenomena, such as baryogenesis or a stochastic
                      gravitational wave background, due to nucleation and
                      percolation of vacuum bubbles in the primordial plasma. A
                      key parameter for predicting these relics is the bubble wall
                      velocity, whose computation relies onsolving the Boltzmann
                      equations of the various speciesalong the bubble profile.
                      Recently it has been shown that an unphysical singularity
                      emerges if one assumes these local quantities to be
                      described as small fluctuations on a constant equilibrium
                      background.In this work we solve this issue by including the
                      spatial dependence of thebackground into the fluid Ansatz.
                      This leads to a modification of the Boltzmann equation, and
                      all terms that would give rise to a singularity now
                      vanish.We recalculate the different contributions to the
                      counter-pressure of the plasma on the expanding wall, and
                      discuss their relative importance. The Standard Model with a
                      low cutoff is chosen as benchmark model and the results are
                      shown for different values of the cutoff scale Λ. In this
                      setup, deflagration solutions are found for almost all the
                      values of Λ considered, while detonations are found only
                      for some restricted corner of the parameter space.},
      keywords     = {cosmological phase transitions (autogen) / particle physics
                      - cosmology connection (autogen) / physics of the early
                      universe (autogen) / primordial gravitational waves (theory)
                      (autogen)},
      cin          = {T},
      ddc          = {530},
      cid          = {I:(DE-H253)T-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)16},
      eprint       = {2412.09266},
      howpublished = {arXiv:2412.09266},
      archivePrefix = {arXiv},
      SLACcitation = {$\%\%CITATION$ = $arXiv:2412.09266;\%\%$},
      doi          = {10.1088/1475-7516/2025/04/033},
      url          = {https://bib-pubdb1.desy.de/record/643046},
}