22,993 research outputs found
Radiation and energy release in a background field of axion-like dark matter
We find that a fuzzy dark matter background and the mG scale magnetic field
in the galactic center can give rise to a radiation with a very large energy
release. The frequency of the radiation field is the same as the frequency of
the oscillating axion-like background field. We show that there is an energy
transfer between the fuzzy dark matter sector and the electromagnetic sector
because of the presence of the generated radiation field and the galactic
magnetic field. The energy release rate of radiation is found to be very slow
in comparison with the energy of fuzzy dark matter but could be significant
comparing with the energy of galactic magnetic field in the source region.
Using this example, we show that the fuzzy dark matter together with a large
scale magnetic field is possible to give rise to fruitful physics.Comment: 9 pages, no figure, references added, version in PL
A Light Sterile Neutrino from Friedberg-Lee Symmetry
Light sterile neutrinos of mass about an eV with mixing of a
few percent to active neutrinos may solve some anomalies shown in experimental
data related to neutrino oscillation. How to have light sterile neutrinos is
one of the theoretical problems which have attracted a lot of attentions. In
this article we show that such an eV scale light sterile neutrino candidate can
be obtained in a seesaw model in which the right-handed neutrinos satisfy a
softly-broken Friedberg-Lee (FL) symmetry. In this model a right-handed
neutrino is guaranteed by the FL symmetry to be light comparing with other two
heavy right-handed neutrinos. It can be of eV scale when the FL symmetry is
softly broken and can play the role of eV scale sterile neutrino needed for
explaining the anomalies of experimental data. This model predicts that one of
the active neutrino is massless. We find that this model prefers inverted
hierarchy mass pattern of active neutrinos than normal hierarchy. An
interesting consequence of this model is that realizing relatively large
and relatively small in this model
naturally leads to a relatively small . This interesting
prediction can be tested in future atmospheric or solar neutrino experiments.Comment: 14 pages, references added, version for publication in PL
Scalar resonance at 750 GeV as composite of heavy vector-like fermions
We study a model of scalars which includes both the SM Higgs and a scalar
singlet as composites of heavy vector-like fermions. The vector-like fermions
are bounded by the super-strong four-fermion interactions. The scalar singlet
decays to SM vector bosons through loop of heavy vector-like fermions. We show
that the surprisingly large production cross section of di-photon events at 750
GeV resonance and the odd decay properties can all be explained. This model
serves as a good model for both SM Higgs and a scalar resonance at 750 GeV.Comment: 12 pages, no figure, references updated, version for publicatio
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