Sterile neutrino dark matter as a consequence of νMSM-induced lepton asymmetry

By M. Laine, M. Shaposhnikov. 2008

222 citations recorded by the source corpus.

It has been pointed out by one of the authors (Shaposhnikov 2008 Preprint 0804.4542) that in the νMSM (Standard Model extended with three right-handed neutrinos with masses smaller than the electroweak scale), there is a corner in the parameter space where CP-violating resonant oscillations among the two heaviest right-handed neutrinos continue to operate below the freeze-out temperature of sphaleron transitions, leading to a lepton asymmetry which is considerably larger than the baryon asymmetry. Consequently, the lightest right-handed (‘sterile’) neutrinos, which may serve as dark matter, are generated through an efficient resonant mechanism proposed by Shi and Fuller (1999 Phys. Rev. Lett. 82 2832 [astro-ph/9810076]). We re-compute the dark matter relic density and non-eq uilibrium momentum distribution function in this situation with quantum field theoretic methods and, confronting the results with existing astrophysical data, derive bounds on the properties of the lightest right-handed neutrinos. Our spectra can be used as an input for structure formation simulations in warm dark matter cosmologies, for a Lyman-α analysis of the dark matter distribution on small scales, and for studying the properties of haloes of dwarf spheroidal galaxies.

Subfields: Artificial Intelligence, Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/5d50eab0d4a3b81b94b9998b4c092ae19635aea3

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Citations in the corpus

Flavor structures of charged fermions and massive neutrinos (2019, background): “Given the fact that such sterile particles are unable to thermalize in an easy way, the simplest mechanism for their production is either via non-resonant active-sterile neutrino oscillations [118, 639] or through resonant active-sterile neutrino oscillations in the presence of a non-negligible lept”
A facility to search for hidden particles at the CERN SPS: the SHiP physics case (2015, background): “The two thick black lines bounding this region are production curves for nonresonant production [727] (upper line, “NRP”) and for resonant production (RP) with the maximal lepton asymmetry, attainable in the νMSM (lower line, marked “L 6 = 120”) [416, 696, 728] (L6 is defined as the ratio of the lep”
Sterile neutrino Dark Matter (2018, background): “An alternative approach that is based on a perturbative solution of the quantum kinetic equation for %̂ itself (known as von Neumann equation) has been presented in [38, 239] (cf.”
The Role of Sterile Neutrinos in Cosmology and Astrophysics (2008, methodology): “onents happen to peak around q res ∼ 0.25−1. Their width and height depends on L 6 and M 1. The dependence of the average momentum hqi on the mass and lepton asymmetry is shown in Fig. 2b (taken from [49]). The black solid curve is the ratio of average momenta, computed over exact NRP spectra to the”
Leptogenesis (2008, unknown): “If they succeed in establishing the Majorana nature of the light neutrinos,(25) this will strengthen our confidence that the seesaw mechanism is at the origin of the neutrino masses and, most importantly, will (24)The opposite result would not disprove sphaleron physics: see [283, 284] for a model i”
A lower bound on the mass of dark matter particles (2008, methodology): “Primordial fmax is computed numerically based on the spectra from [67, 68].”
A White Paper on keV sterile neutrino Dark Matter (2016, background): “3 [663, 664, 670, 686, 730, 747] and resonant production [314, 316, 317, 691], see Secs.”
Constraints from Ly-α forests on non-thermal dark matter including resonantly-produced sterile neutrinos (2017, methodology): “We solve the Boltzmann equations in the expanding Universe numerically with the CAMB7 [58] and CLASS8 [59] softwares and compute the linear power spectrum of matter density fluctuations at z = 30.”
The Cosmic Linear Anisotropy Solving System (CLASS) IV: efficient implementation of non-cold relics (2011, methodology): “(Left) example of a non-thermal phase-space distribution function applying to resonantly produced sterile neutrinos [18], compared to a Fermi-Dirac distribution.”
Detecting non-relativistic cosmic neutrinos by capture on tritium: phenomenology and physics potential (2014, background): “, [75–77]), where O(10−3)−O(1) lepton asymmetry in the neutrino sector can be created, and the current constraints are at the level of nL/nγ .”