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  • Letter
  • Open Access

Fireball baryogenesis from early structure formation due to Yukawa forces

Marcos M. Flores1, Alexander Kusenko1,2,3, Lauren Pearce4, and Graham White2

  • 1Department of Physics and Astronomy, University of California, Los Angeles, Los Angeles, California, 90095-1547, USA
  • 2Kavli Institute for the Physics and Mathematics of the Universe (WPI), UTIAS, The University of Tokyo, Kashiwa, Chiba 277-8583, Japan
  • 3Theoretical Physics Department, CERN, 1211 Geneva 23, Switzerland
  • 4Pennsylvania State University-New Kensington, New Kensington, Pennsylvania 15068, USA

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Phys. Rev. D 108, L091705 – Published 28 November, 2023

DOI: https://doi.org/10.1103/PhysRevD.108.L091705

Abstract

We show that viable electroweak baryogenesis can be realized without a first-order phase transition if plasma is heated inhomogeneously by nongravitational structure formation in some particle species. Yukawa interactions can mediate relatively long-range attractive forces in the early Universe. This creates an instability and leads to growth of structure in some species even during the radiation dominated era. At temperatures below the electroweak scale, the collapsing and annihilating halos can heat up plasma in fireballs that expand and create the out-of-equilibrium high-temperature environment suitable for generating the baryon asymmetry. The plasma temperature at the time of baryogenesis can be as low as a few MeV, making it consistent with both standard and low-reheat cosmologies.

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Information

Phys. Rev. D 108, L091705– Published 28 November, 2023
  • Received 4 September 2022
  • Accepted 2 November 2023
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