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Leptogenesis and Dark Matter related ?

Nicolas Cosme, Laura Lopez Honorez, Michel H. G. Tytgat

TL;DR

This work investigates whether dark matter and the baryon asymmetry can originate from a single mechanism via leptogenesis in a left-right symmetric extension, proposing a GeV-scale right-handed neutrino as dark matter and a strongly interacting messenger that transfers asymmetry. A key result shows that the ratio ${ rac{ obracket _B}{ obracket _{DM}}}$ fixes the dark-matter mass at about $m_{ u_R} oughly 3$ GeV, with the dark sector dynamics controlled by a narrow parameter window $v_R oughly 10^{7}$–$10^{11}$ TeV and $h_d oughly 10^{-7}$–$10^{-5}$. The scenario requires late but not-too-late messenger decays and yields a non-thermal, effectively undetectable dark matter candidate, though the associated messenger could be probed at colliders in the lower end of its mass range. Overall, the paper highlights both a theoretically coherent link between baryon and dark-matter densities and the substantial experimental challenges posed by such a mechanism.

Abstract

We investigate the possibility that dark matter and the baryon asymmetry of the Universe are generated by the same mechanism, following an idea initially proposed by V.A. Kuzmin and recently discussed by R. Kitano and I. Low. In our model, based on a left-right extension of the Standard Model, the baryon asymmetry is generated through leptogenesis and dark matter is made of relic stable right-handed neutrinos with mass ~ few GeV. Constraints on the model imply that this form of dark matter would unfortunately escape detection.

Leptogenesis and Dark Matter related ?

TL;DR

This work investigates whether dark matter and the baryon asymmetry can originate from a single mechanism via leptogenesis in a left-right symmetric extension, proposing a GeV-scale right-handed neutrino as dark matter and a strongly interacting messenger that transfers asymmetry. A key result shows that the ratio fixes the dark-matter mass at about GeV, with the dark sector dynamics controlled by a narrow parameter window – TeV and –. The scenario requires late but not-too-late messenger decays and yields a non-thermal, effectively undetectable dark matter candidate, though the associated messenger could be probed at colliders in the lower end of its mass range. Overall, the paper highlights both a theoretically coherent link between baryon and dark-matter densities and the substantial experimental challenges posed by such a mechanism.

Abstract

We investigate the possibility that dark matter and the baryon asymmetry of the Universe are generated by the same mechanism, following an idea initially proposed by V.A. Kuzmin and recently discussed by R. Kitano and I. Low. In our model, based on a left-right extension of the Standard Model, the baryon asymmetry is generated through leptogenesis and dark matter is made of relic stable right-handed neutrinos with mass ~ few GeV. Constraints on the model imply that this form of dark matter would unfortunately escape detection.

Paper Structure

This paper contains 9 sections, 27 equations, 2 figures.

Table of Contents

  1. Introduction
  2. Matter Genesis
  3. The Model
  4. Initial B-L asymmetry
  5. Annihilation of messenger particles
  6. Decay of messengers into $\nu_R$
  7. Summary of constraints
  8. Observational implications ?
  9. Conclusion

Figures (2)

  • Figure 1: Steps of the Matter Genesis scenario
  • Figure 2: $\log (\kappa_R/TeV)$ as a function of $\log(h_d)$. The different constraints : (\ref{['DdBBN']}) line, (\ref{['DdAnn']}) dashed, (\ref{['nuRH']}) dot-dashed (the excluded region is under these lines) and (\ref{['DAnn']}) dotted (the excluded region is over this line). The allowed region is in green.