Pulsar Kicks From Neutrino Oscillations

Kusenko, Alexander

doi:10.1142/s0218271804006486

Cited by 61 publications

(65 citation statements)

References 43 publications

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“…Sterile neutrinos produced at smaller radii (higher temperatures) carry greater average momentum than those produced at larger radii (lower temperatures), yielding an asymmetric momentum distribution of emitted neutrinos. This asymmetry is capable of producing the observed pulsar kicks, in the direction of the magnetic field, when the mass and coupling of the sterile state is near 8 keV and above 1.5 × 10 −5 , respectively [45]. We found the "best fit" to the LSND data (using ν 4 and ν 5 ) and pulsar kicks (using ν 6 ) and m 6 > 5 keV.…”

Section: Pulsar Kicksmentioning

confidence: 69%

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Neutrino phenomenology of very low-energy seesaw scenarios

2007

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The Standard Model augmented by the presence of gauge-singlet right-handed neutrinos proves to be an ideal scenario for accommodating nonzero neutrino masses. Among the new parameters of this "New Standard Model" are right-handed neutrino Majorana masses M . Theoretical prejudice points to M much larger than the electroweak symmetry breaking scale, but it has recently been emphasized that all M values are technically natural and should be explored. Indeed, M around 1 − 10 eV can accommodate an elegant oscillation solution to the LSND anomaly, while other M values lead to several observable consequences. We consider the phenomenology of low energy (M 1 keV) seesaw scenarios. By exploring such a framework with three right-handed neutrinos, we can consistently fit all oscillation data -including those from LSND -while partially addressing several astrophysical puzzles, including anomalous pulsar kicks, heavy element nucleosynthesis in supernovae, and the existence of warm dark matter. Furthermore, low-energy seesaws -regardless of their relation to the LSND anomaly -can also be tested by future tritium beta-decay experiments, neutrinoless double-beta decay searches, and other observables. We estimate the sensitivity of such probes to M .

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Section: Pulsar Kicksmentioning

confidence: 69%

“…Following [45], we separate and analyze these within three distinct categories. Each one requires the existence of a keV-scale sterile neutrino with very small couplings to the active flavors, of the order 10 −4 − 10 −5 , especially if light sterile neutrinos are thermally produced in the early universe.…”

Section: Pulsar Kicksmentioning

confidence: 99%

Neutrino phenomenology of very low-energy seesaw scenarios

2007

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“…), (20) in the L ≃ 10 −10 ≃ 0 case. If the sterile neutrinos occupy this tiny window, they could still be the dark matter and generate pulsar kicks [50,51,52,53,54] [34,35] strongly suggest that the standard L = 0 production scenario of Abazajian et al [12,31,32] is no longer viable. A point source-subtracted XMM and/or Chandra spectrum of Andromeda (and/or other nearby, massive yet quiescent spiral galaxies) extracted from within a radius of ≥ 50 ′ − 500 ′ would probe > ∼ 10−100 times more dark matter than the observations we have considered here [64].…”

Section: Discussionmentioning

confidence: 99%

Direct x-ray constraints on sterile neutrino warm dark matter

et al. 2006

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Warm dark matter (WDM) might more easily account for small scale clustering measurements than the heavier particles typically invoked in Λ cold dark matter (ΛCDM) cosmologies. In this paper, we consider a ΛWDM cosmology in which sterile neutrinos νs, with a mass ms of roughly 1-100 keV, are the dark matter. We use the diffuse X-ray spectrum (total minus resolved point source emission) of the Andromeda galaxy to constrain the rate of sterile neutrino radiative decay: νs → νe,µ,τ + γ. Our findings demand that ms < 3.5 keV (95% C.L.) which is a significant improvement over the previous (95% C.L.) limits inferred from the X-ray emission of nearby clusters, ms < 8.2 keV (Virgo A) and ms < 6.3 keV (Virgo A + Coma).

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“…There is also an indication that one or more light sterile mass eigenstates may cause the flavor transformation seen in the Los Alamos Liquid Scintillator Neutrino Detector (LSND) experiment [31,32]. Another intriguing motivation for the presence of a dark matter sterile neutrino is abundance of anomalously high pulsar velocities that may be difficult to produce in the convective hydrodyamics in a supernova, but may be produced in assymetric sterile neutrino emission from a hot nascent neutron star [33,34,35]. However, whether convective overturn and the resulting global asymmetry in the ejecta alone can power the observed distribution of pulsar velocities remains an open question [36,37].…”

Section: Introductionmentioning

confidence: 99%

Production and evolution of perturbations of sterile neutrino dark matter

2006

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Sterile neutrinos, fermions with no standard model couplings [SU(2) singlets], are predicted by most extensions of the standard model, and may be the dark matter. I describe the nonthermal production and linear perturbation evolution in the early universe of this dark matter candidate. I calculate production of sterile neutrino dark matter including effects of Friedmann dynamics dictated by the quark-hadron transition and particle population, the alteration of finite temperature effective mass of active neutrinos due to the presence of thermal leptons, and heating of the coupled species due to the disappearance of degrees of freedom in the plasma. These effects leave the sterile neutrinos with a non-trivial momentum distribution. I also calculate the evolution of sterile neutrino density perturbations in the early universe through the linear regime and provide a fitting function form for the transfer function describing the suppression of small scale fluctuations for this warm dark matter candidate. The results presented here differ quantitatively from previous work due to the inclusion here of the relevant physical effects during the production epoch.

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Pulsar Kicks From Neutrino Oscillations

Cited by 61 publications

References 43 publications

Neutrino phenomenology of very low-energy seesaw scenarios

Neutrino phenomenology of very low-energy seesaw scenarios

Direct x-ray constraints on sterile neutrino warm dark matter

Production and evolution of perturbations of sterile neutrino dark matter

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