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Asymgenesis

Martin A. Mojahed, Sascha Weber

Abstract

We present a framework based on the standard type-I seesaw model that relates the baryon asymmetry of the universe to the dark matter (DM) density. The framework, which we name "Asymgenesis", relies on the presence of primordial charge asymmetries seeded either in the dark sector or in the visible sector. A higher-dimensional portal operator reshuffles this initial asymmetry into both sectors, eventually resulting in a nonzero $B-L$ asymmetry and an asymmetric DM component. Compared to conventional asymmetric-dark-matter (ADM) schemes, our framework imposes far milder requirements on the portal interaction. In particular, the portal interaction need not violate $B-L$, and the temperature scales of efficient $B-L$ violation and efficient charge-transfer interaction mediated by the portal operator can be separated. We develop the formalism in detail and argue that the flexibility of our framework enlarges the model-building landscape for ADM.

Asymgenesis

Abstract

We present a framework based on the standard type-I seesaw model that relates the baryon asymmetry of the universe to the dark matter (DM) density. The framework, which we name "Asymgenesis", relies on the presence of primordial charge asymmetries seeded either in the dark sector or in the visible sector. A higher-dimensional portal operator reshuffles this initial asymmetry into both sectors, eventually resulting in a nonzero asymmetry and an asymmetric DM component. Compared to conventional asymmetric-dark-matter (ADM) schemes, our framework imposes far milder requirements on the portal interaction. In particular, the portal interaction need not violate , and the temperature scales of efficient violation and efficient charge-transfer interaction mediated by the portal operator can be separated. We develop the formalism in detail and argue that the flexibility of our framework enlarges the model-building landscape for ADM.

Paper Structure

This paper contains 1 section, 20 equations, 4 figures, 1 table.

Table of Contents

  1. On the relation between Asymgenesis and other charge-transfer mechanisms

Figures (4)

  • Figure 1: Left: Schematic of standard ADM models with charge transfer mediated by higher-dimensional operator(s) (adapted from Ref. Zurek:2013wia). Right: A schematic of charge transfer in Asymgenesis.
  • Figure 2: Schematic evolution of chemical potentials in Asymgenesis for $T_{\rm{eq}}>T_{B-L}$ (left) and $T_{B-L}>T_{\rm{eq}}$ (right). Here, $T_{\rm{CG}},\,T_{B-L},\,T_{\rm{eq}},\,T_C,$ and $T_{\rm{EW}}$ denote the temperature scales associated with chargegenesis, RHN interactions becoming inefficient, decoupling of charge transfer between the dark and visible sectors, $C$-violating interactions becoming efficient, and the electroweak phase transition, respectively.
  • Figure 3: Numerical result for $\kappa$$(\Tilde{\kappa})$, defined in Eq. \ref{['YDeltaXFinal']} (Eq. \ref{['Yekappadef']}) for charge transfer from the SM (DM) sector to the DM (SM) sector, in the $T_{\rm{CG}}-\Lambda$ plane. See text for details.
  • Figure 4: Schematic comparison between Asymgenesis, standard ADM based on charge transfer via higher-dimensional operators, and Higgsogenesis. See text for details.