67 research outputs found
Cosmic rays of leptons from Pulsars and Supernova Remnants
The latest results from PAMELA and FERMI experiments confirm the necessity to
improve theoretical models of production and propagation of galactic electrons
and positrons. There are many possible explanations for the positron excess
observed at energies larger than 10 GeV and for some features around 1 TeV in
the total flux of electrons and positrons. Supernovae are astrophysical objects
with the potential to explain these observations. In this work, we present an
updated study of the astrophysical sources of lepton cosmic rays and the
possible and the possible explanation of the anomalies in terms of
astrophysical sources.Comment: 6 pages, 1 figures, Proceeding for the Conference on Cosmic Rays for
Particle and Astroparticle Physics, CRICATPP 2010, Como, Ital
Connecting neutrino physics with dark matter
The origin of neutrino masses and the nature of dark matter are two of the
most pressing open questions of the modern astro-particle physics. We consider
here the possibility that these two problems are related, and review some
theoretical scenarios which offer common solutions. A simple possibility is
that the dark matter particle emerges in minimal realizations of the see-saw
mechanism, like in the majoron and sterile neutrino scenarios. We present the
theoretical motivation for both models and discuss their phenomenology,
confronting the predictions of these scenarios with cosmological and
astrophysical observations. Finally, we discuss the possibility that the
stability of dark matter originates from a flavour symmetry of the leptonic
sector. We review a proposal based on an A_4 flavour symmetry.Comment: 21 pages, 4 figures. Review prepared for the focus issue on "Neutrino
Physics". Matches published versio
Dark Matter candidates in a Type-II radiative neutrino mass model
We explore the connection between Dark Matter and neutrinos in a model
inspired by radiative Type-II seessaw and scotogenic scenarios. In our model,
we introduce new electroweakly charged states (scalars and a vector-like
fermion) and impose a discrete symmetry. Neutrino masses are
generated at the loop level and the lightest -odd neutral
particle is stable and it can play the role of a Dark Matter candidate. We
perform a numerical analysis of the model showing that neutrino masses and
flavour structure can be reproduced in addition to the correct dark matter
density, with viable DM masses from 700 GeV to 30 TeV. We explore direct and
indirect detection signatures and show interesting detection prospects by CTA,
Darwin and KM3Net and highlight the complementarity between these observables.Comment: 37 pages, 13 figures; mu to e gamma analysis added, matches the
version published in JHE
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