Affleck-Dine (pseudo)-Dirac neutrinogenesis

Abel, Steven; Pagé, Véronique

doi:10.1088/1126-6708/2006/05/024

Cited by 29 publications

(28 citation statements)

References 31 publications

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“…What is perhaps most surprising is the fact that leptogenesis could proceed successfully even if the neutrinos are Dirac particles and lepton number is not broken [259,260] (except, of course, by the sphaleron interactions). Such scenarios have been termed 'Dirac leptogenesis' [260][261][262][263][264][265][266]. Actually, the success of Dirac leptogenesis is closely related to the extreme smallness of the neutrino Yukawa couplings in this scenario.…”

Section: Dirac Leptogenesismentioning

confidence: 99%

Leptogenesis

2008

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Leptogenesis is a class of scenarios where the baryon asymmetry of the Universe is produced from a lepton asymmetry generated in the decays of a heavy sterile neutrino. We explain the motivation for leptogenesis. We review the basic mechanism, and describe subclasses of models. We then focus on recent developments in the understanding of leptogenesis: finite temperature effects, spectator processes, and in particular the significance of flavor physics.Comment: 111 pages, 8 figures. Added Sect. 3 on anomalous B+L violation. Corrected equations (6.30) and (6.31). Added Sect. 9.1 with a simple example of the effects of flavours. Revised Sect. 10.1 on susy leptogenesis. Added several references, and other minor improvements. To be published in Physics Report

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Section: Dirac Leptogenesismentioning

confidence: 99%

Leptogenesis

2008

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“…1 Another attractive feature of considering such sneutrino DM is that it might afford a dynamical explanation of the baryon-to-dark-matter ratio Ω b /ΩDM 1/5 as the DM can now possess a lepton number asymmetry connected to the baryon-number-asymmetry, in contradistinction to Majorana neutralino DM matter which can carry no such asymmetry. We will not pursue these ideas in this work, but see [1,2,3,4,5,6,7,8,9,10,11,12,13,14] for studies along these lines.…”

Section: Introductionmentioning

confidence: 99%

Neutrino-flavoured sneutrino dark matter

March-Russell

McCabe

McCullough

2010

J. High Energ. Phys.

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A simple theory of supersymmetric dark matter (DM) naturally linked to neutrino flavour physics is studied. The DM sector comprises a spectrum of mixed lhdrhd sneutrino states where both the sneutrino flavour structure and mass splittings are determined by the associated neutrino masses and mixings. Prospects for indirect detection from solar capture are good due to a large sneutrino-nucleon cross-section afforded by the inelastic splitting (solar capture limits exclude an explanation of DAMA/LIBRA). We find parameter regions where all heavier states will have decayed, leaving only one flavour mixture of sneutrino as the candidate DM. Such regions have a unique 'smoking gun' signature-sneutrino annihilation in the Sun produces a pair of neutrino mass eigenstates free from vacuum oscillations, with the potential for detection at neutrino telescopes through the observation of a hard spectrum of ν µ and ν τ (for a normal neutrino hierarchy). Next generation direct detection experiments can explore much of the parameter space through both elastic and inelastic scattering. We show in detail that the observed neutrino masses and mixings can arise as a consequence of supersymmetry breaking effects in the sneutrino DM sector, consistent with all experimental constraints.

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“…A few models have been proposed to naturally explain this coincidence (see e.g. [35,36,37,38,39,40,41,42,43,44]). They tend to be sophisticated in comparison with the model discussed here and, to our knowledge, they also tend to have cross sections for scattering of dark matter with nuclei that are much below the sensitivity of existing and forthcoming detectors.…”

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confidence: 99%

WIMP dark matter, Higgs exchange and DAMA

Andreas

Hambye

Tytgat

2008

J. Cosmol. Astropart. Phys.

174

166

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In the WIMP scenario, there is a one-to-one relation between the dark matter (DM) relic density and spin independent direct detection rate if both the annihilation of DM and its elastic scattering on nuclei go dominantly through Higgs exchange. In particular, for DM masses much smaller than the Higgs boson mass, the ratio of the relevant cross sections depends only on the DM mass. Assuming DM mass and direct detection rate within the ranges allowed by the recent DAMA collaboration results -taking account of the channelling effect on energy threshold and the null results of the other direct detection experiments-gives a definite range for the relic density. For scalar DM models, like the Higgs portal models or the inert doublet model, the relic density range turns out to be in agreement with WMAP. This scenario implies that the Higgs boson has a large branching ratio to pairs of DM particles, a prediction which might challenge its search at the LHC.The DAMA collaboration has recently provided evidence for an annual modulation of the rate of nuclear recoils in their detector [1], confirming at a firmer level their previous results [2]. Taking into account the null results of the other direct Dark Matter (DM) detection experiments [3] and the recently discovered channelling effect on the threshold energy in DAMA, points towards a nuclear recoil due to dark matternucleon elastic scatterings, with a spin independent (SI) cross section in the range (see [4])and dark matter mass in the range 3 GeV m DM 8 GeV.These results have been already the object of various studies in specific models [5,6,7,8]. In this short letter, working in the WIMP framework which assumes a DM relic density determined by the thermal freeze-out of DM annihilation, we emphasize the importance of Higgs exchange diagrams for DM mass in the range of (2). If the DM candidate is light, there is a limited number of possible (2-body) annihilation channels to SM particles, i.e. the Inert Doublet Model (IDM), a two Higgs model extension of the Standard Model with a scalar dark matter candidate [10,11,12,13,14,15,16], and a fortiori for a singlet scalar DM candidate [17,18,19,20,21,22,23,24], the channels of Fig.1 are the only possible non-negligible ones in the range of (2). In more sophisticated models, such as with the neutralino DM candidate of the MSSM, these channels coexist a priori with many other channels, in particular with other intermediate Higgs scalar particle or squarks channels [7,25].Both processes in Fig.1 are tightly related. The Higgs boson mass dependence is the same, mh , because in both cases the momentum of the Higgs is negligible compared with m h . Furthermore the dependence in the unknown DM-DM-h coupling is the same. This means that, up to uncertainties in the Yukawa couplings of the SM fermions and in the Higgs to nucleon coupling, the only left parameter is the mass of the dark matter. This dependence is however limited if we take the DM mass within the range (2). In other words, if Higgs mediated processes are dominant, the r...

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Affleck-Dine (pseudo)-Dirac neutrinogenesis

Cited by 29 publications

References 31 publications

Leptogenesis

Leptogenesis

Neutrino-flavoured sneutrino dark matter

WIMP dark matter, Higgs exchange and DAMA

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