Right-handed neutrino dark matter under the B − L gauge interaction

Abstract. We present an overview of scenarios where the observed Dark Matter (DM) abundance consists of Feebly Interacting Massive Particles (FIMPs), produced non-thermally by the so-called freeze-in mechanism. In contrast to the usual freeze-out scenario, frozen-in FIMP DM interacts very weakly with the particles in the visible sector and never attained thermal equilibrium with the baryon-photon fluid in the early Universe. Instead of being determined by its annihilation strength, the DM abundance depends on the decay and annihilation strengths of particles in equilibrium with the baryon-photon fluid, as well as couplings in the DM sector. This makes frozen-in DM very difficult but not impossible to test. In this review, we present the freeze-in mechanism and its variations considered in the literature (dark freeze-out and reannihilation), compare them to the standard DM freeze-out scenario, discuss several aspects of model building, and pay particular attention to observational properties and general testability of such feebly interacting DM.

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“…Freeze-in in the context of U (1) B−L and U (1) Lµ−Lτ symmetry was also considered in Refs. [363,385] and [386], respectively. In Refs.…”

Section: Other Modelsmentioning

confidence: 99%

“…In Refs. [385,387] frozen-in DM particle is a right-handed neutrino, whereas in Ref. [388] DM is produced non-thermally via decays of right-handed neutrinos.…”

Section: Other Modelsmentioning

confidence: 99%

The dawn of FIMP Dark Matter: A review of models and constraints

Bernal

Heikinheimo

Tenkanen

et al. 2017

Int. J. Mod. Phys. A

499

504

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“…Also shown is the potential reach of the proposed SHiP experiment [38], adopted from Refs. [39,40]; of Belle II (for an integrated luminosity of 50 ab −1 ) [41,42]; and of the Heavy Photon Search (HPS) experiment [43], naively converted from limits on hidden photons. Finally, solar neutrino scattering with electrons in future second-generation xenonbased dark matter direct detection experiments such as LZ can further probe the parameter space with limits up to w 1 TeV (LZ line in Fig.…”

Section: A Light Zmentioning

confidence: 99%

Leptogenesis and neutral gauge bosons

Heeck

Teresi

2016

Phys. Rev. D

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We consider low-scale leptogenesis via right-handed neutrinos $N$ coupled to a $Z'$ boson, with gauged $U(1)_{B-L}$ as a simple realization. Keeping the neutrinos sufficiently out of equilibrium puts strong bounds on the $Z'$ coupling strength and mass, our focus being on light $Z'$ and $N$, testable in the near future by SHiP, HPS, Belle II, and at the LHC. We show that leptogenesis could be robustly falsified in a large region of parameter space by the double observation of $Z'$ and $N$, e.g. in the channel $pp\to Z' \to NN$ with displaced $N$-decay vertex, and by several experiments searching for light $Z'$, according to the mass of $N$.Comment: 9 pages, 8 figures; added one figure and minor clarifications, matches PRD versio

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“…For other studies of gauged B −L with a dark matter candidate see Refs. [7][8][9][10][11][12][13][14][15][16][17], and for scenarios that explore a connection between the origin of neutrino masses and the dark matter candidate see Refs. [18][19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Neutrino-dark matter connections in gauge theories

2019

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We discuss the connection between the origin of neutrino masses and the properties of dark matter candidates in the context of gauge extensions of the Standard Model. We investigate minimal gauge theories for neutrino masses where the neutrinos are predicted to be Dirac or Majorana fermions. We find that the upper bound on the effective number of relativistic species provides a strong constraint in the scenarios with Dirac neutrinos. In the context of theories where the lepton number is a local gauge symmetry spontaneously broken at the low scale, the existence of dark matter is predicted from the condition of anomaly cancellation. Applying the cosmological bound on the dark matter relic density, we find an upper bound on the symmetry breaking scale in the multi-TeV region. These results imply we could hope to test simple gauge theories for neutrino masses at current or future experiments. *

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Right-handed neutrino dark matter under the B − L gauge interaction

Cited by 63 publications

References 87 publications

The dawn of FIMP Dark Matter: A review of models and constraints

The dawn of FIMP Dark Matter: A review of models and constraints

Leptogenesis and neutral gauge bosons

Neutrino-dark matter connections in gauge theories

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