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  • Letter
  • Open Access

Baryon asymmetry from dark matter decay in the vicinity of a phase transition

Debasish Borah1,*, Arnab Dasgupta2,†, Matthew Knauss3,‡, and Indrajit Saha1,§

  • 1Department of Physics, Indian Institute of Technology Guwahati, Assam 781039, India
  • 2Pittsburgh Particle Physics, Astrophysics, and Cosmology Center, Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, Pennsylvania 15206, USA
  • 3High Energy Theory Group, William & Mary, Williamsburg, Virginia 23187, USA

  • *dborah@iitg.ac.in
  • †arnabdasgupta@pitt.edu
  • ‡mhknauss@wm.edu
  • §s.indrajit@iitg.ac.in
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Phys. Rev. D 108, L091701 – Published 9 November, 2023

DOI: https://doi.org/10.1103/PhysRevD.108.L091701

Abstract

We propose a novel framework where baryon asymmetry of the Universe can arise due to forbidden decay of dark matter (DM) enabled by finite-temperature effects in the vicinity of a first-order phase transition (FOPT). In order to implement this novel cogenesis mechanism, we consider the extension of the standard model by one scalar doublet η, three right-handed neutrinos (RHNs), all odd under an unbroken Z2 symmetry, popularly referred to as the scotogenic model of radiative neutrino mass. While the lightest RHN N1 is the DM candidate and stable at zero temperature, there arises a temperature window prior to the nucleation temperature of the FOPT assisted by η, where N1 can decay into η and leptons, generating a nonzero lepton asymmetry which gets converted into baryon asymmetry subsequently by sphalerons. The requirement of successful cogenesis together with a first-order electroweak phase transition not only keeps the mass spectrum of new particles in the sub-TeV ballpark within reach of collider experiments, but also leads to observable stochastic gravitational wave spectrum which can be discovered in planned experiments like the Laser Interferometer Space Antenna.

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Phys. Rev. D 108, L091701– Published 9 November, 2023
  • Received 11 August 2023
  • Accepted 12 October 2023
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