Theory and phenomenology of Planckian interacting massive particles as dark matter

We propose a minimal seesaw extension to simultaneously account for realistic neutrino mass and mixing, the baryon asymmetry of the Universe via leptogenesis and a viable dark matter relic density, in which two right-handed neutrinos are coupled to a dark Dirac fermion and complex scalar field, both charged under a global U (1)D symmetry. As a concrete example, we consider the Littlest Seesaw model which describes neutrino mass and mixing and accounts for leptogenesis, thereby fixing the neutrino Yukawa couplings and right-handed neutrino masses. By considering the freezein production mechanism of dark matter, we explore the parameter space of right-handed neutrino portal couplings and dark particle masses which give the correct dark matter relic abundance, focussing on the case of a superheavy Dirac fermion dark matter particle, with a mass around 10 10 GeV. Such a FIMPzilla can provide a successful explanation of the dark matter relic abundance, with its production reliant on neutrino Yukawa couplings over much of the parameter space, depending on the assumed dark particle masses, and the reheat temperature. CONTENTS

Section: Boltzmann Equations For Heavy Scalar Massmentioning

confidence: 99%

Minimal seesaw extension for neutrino mass and mixing, leptogenesis and dark matter: FIMPzillas through the right-handed neutrino portal

Chianese

King

2020

“…The focus of the studies has been on the generation of dark matter during inflation [42][43][44][45][46][47] or at preheating and reheating [64][65][66][67][68][69][70][71][72]. Graviton-mediated thermal production has also been explored [70][71][72][73][74][75][76].…”

Section: Introductionmentioning

confidence: 99%

Misalignment & Co.: (pseudo-)scalar and vector dark matter with curvature couplings

Alonso-Álvarez

Hügle

Jaeckel

2020

106

“…In SO(10) unified theories, massive gauge bosons can play the role of heavy mediators yielding also small couplings [33][34][35]. Similar suppressions also arise in massive spin-2 theories [36,37], string theory inspired moduli portal scenarios [38] and in scenarios containing Chern-Simons type couplings [39]. A notable feature in all these constructions is a sharp temperature dependence of the DM relic density -beyond the conventional reheating temperature (T RH ) -up to some maximum temperature (T MAX ) accessible during the reheating process [40,41].…”

Section: Introductionmentioning

confidence: 74%

Dark matter seeping through dynamic gauge kinetic mixing

Banerjee

Bhattacharyya

Chowdhury

et al. 2019

We show for the first time that the loop-driven kinetic mixing between visible and dark Abelian gauge bosons can facilitate dark matter production in the early Universe by creating a 'dynamic' portal, which depends on the energy of the process. The required smallness of the strength of the portal interaction, suited for freeze-in, is justified by a suppression arising from the mass of a heavy vector-like fermion. The strong temperature sensitivity associated with the interaction is responsible for most of the dark matter production during the early stages of reheating.