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Dark Matter Decay between Phase Transitions at the Weak Scale.

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A new dark matter model proposes abundance from decay, not freeze-out. A "VEV flip-flop" mechanism successfully reduces dark matter particle numbers before the electroweak phase transition.

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Area of Science:

  • Cosmology
  • Particle Physics
  • Astrophysics

Background:

  • The standard model of particle physics does not account for dark matter.
  • The weakly interacting massive particle (WIMP) paradigm is a leading candidate but faces challenges.
  • Alternative dark matter models are crucial for a complete understanding of the universe.

Purpose of the Study:

  • To propose a novel dark matter paradigm based on particle decay rather than thermal freeze-out.
  • To investigate a "VEV flip-flop" mechanism for setting dark matter abundance.
  • To explore phenomenological viability and detection prospects of this new model.

Main Methods:

  • Consideration of fermionic singlet dark matter coupled to a scalar mediator.
  • Modeling dark matter decay via mixing with charged fermions before the electroweak phase transition.
  • Analysis of symmetry breaking and restoration in the dark sector driven by vacuum expectation values (VEVs).

Main Results:

  • The proposed "VEV flip-flop" scenario successfully reduces an initially large dark matter abundance to observed levels.
  • A concrete model demonstrates phenomenological success in key parameter regions.
  • The scenario allows for dark matter decay before the electroweak phase transition.

Conclusions:

  • The decay-driven dark matter abundance mechanism offers a viable alternative to WIMP freeze-out.
  • The "VEV flip-flop" model presents a compelling new direction for dark matter research.
  • Further investigation into LHC and other detection prospects is warranted.