Neutralino decaying dark matter
different R-parity violating couplings can yield an unstable
neutralino. We show that in this context astrophysical and
cosmological constraints on neutralino decaying dark matter forbid
bilinear R-parity breaking neutralino decays and lead to a class of
purely trilinear R-parity violating scenarios in which the
neutralino is stable on cosmological scales. We have found that
among the resulting models some of them become suitable to explain
the observed anomalies in cosmic-ray electron/positron fluxes.
Cosmic antimatter: is there room for exotic sources?
cosmic antimatter and of the main experimental results on
positrons and antiprotons in cosmic rays.
The interpretations of the data in terms of astrophysical
sources will be presented, and the possible contribution of dark matter
annihilation in the galactic halo will be inspected.
I will address some perspectives in light of forthcoming space missions and
theoretical advancements.
Fermion masses and mixing from non-abelian discrete symmetries
non-abelian discrete symmetries work in explaining the experimental
pattern of fermion masses and mixing. In particular, I will analyze the
case of S4, showing that in the neutrino sector this group
helps in reproducing the approximate Tri-Bimaximal mixing structure of the lepton mixing matrix. The extension to the quark sector of the S4 symmetry and its consequences
are also briefly discussed.
SARAH - A Tool for SUSY Model Builders
Tri-bimaximal Mixing and Cabibbo Angle in S_4 Flavor Model with SUSY
Taking vacuum alignments of relevant gauge singlet scalars, we predict the quark mixing as well as the tri-bimaximal mixing of neutrino flavors.
Especially, the Cabibbo angle is predicted to be 15 degree in the limit of the vacuum alignment.
Considering the next leading order, we predict the deviation from the tri-bimaximal mixing.
Flavor symmetry also constraints the sleptons structure, then we discuss the FCNC.
Do cosmological data favor neutrino mass and Dark Energy coupled to Dark Matter?
Unified Model of Fermion Masses with Wilson Line Flavor Symmetry Breaking
Neutrino asymmetry and growth of cosmological magnetic fields
Neutrino propagation with random magnetic fields.
nonstandard neutrino-quark interactions
Dynamo in Context of Riemannian Geometry: A Mathematical Tool and Cosmological Applications
Neutrino masses and mixing and different mass hierarchies in mu-nuSSM
TeV scale seesaw mechanism involving right-handed neutrinos and R-parity violation are together instrumental for the light neutrino mass generation. We show that in mu-nuSSM all three neutrinos acquire massat the tree level consistent with the three flavour global data even with
diagonal neutrino Yukawa couplings. We further show that inclusion of one-loop corrections can alter the tree level neutrino masses and mixing in a significant manner. We find that it is relatively easier to accommodate the normal hierarchical mass pattern compared to the inverted
hierarchical or quasi-degenerate case, with the ingression of one-loop radiative correction. Nice correlation between tree level neutrino mixing angles and ratios of R-parity violating two-body decay branching ratio of the lightest neutralino is a characteristic feature of this model.
These correlations were analyzed for different lightest neutralino composition and different neutrino mass hierarchy and together with the study of displaced vertices these can provide useful experimental
signature of mu-nuSSM at the Large Hadron Collider (LHC).
Neutrinos at the Terascale - a tale of 3.5 frontiers
-the Majorana frontier
-the Unification frontier
-the Flavor frontier
-the Exotics frontier
Discrete flavour groups for neutrino mixing
Fermion masses and mixings in a mu-tau symmetric SO(10)
are considered for fermion masses using both type-I and type-II seesaw mechanism. Small explicit breaking of the $\mu$-$\tau$ symmetry is then shown to provide a very good understanding of all the fermion masses and mixing. One obtains a very good fit to all observables in the context of
the type-I seesaw mechanism but type-II seesaw model also provides a good description except for the overall scale of the neutrino masses. Three major predictions on the leptonic mixing parameters in the type-I seesaw case are (1) the atmospheric mixing angle $\theta_{23}^{l}$ close to
maximal, (2) theta13^{l}$ close to the present upper bound and (3) negative but very small Dirac CP violating phase in the neutrino oscillations.
The Higgs as a harbinger of flavor symmetry
symmetry which requires three scalar SU(2) doublets. The spectrum is fixed by minimizing the scalar potential, and we observe that the symmetry of the model leads to tantalizing Higgs decay modes potentially observable at the CERN Large
Hadron Collider (LHC).
Dark matter models with large annihilation cross section
Hypermagnetic field as a seed of Maxwellian field: magnetic helicity transfer
Hypermagnetic field as a seed of Maxwellian field: magnetic helicity transfer
is much more restrictive in astrophysical objects than the magnetic field energy conservation. Rotation of galaxies, stars, etc. feeds magnetic field energy (i.e. (B^2/8\pi)\sim amplitude^2 is growing due to dynamo).
Same rotation does not influence helicity at all. Only a small helicity parameter (parity violating in isotropic= not rotating early Universe) provides amplification both energy (amplitude) and magnetic helicity in primordial plasma.
The evolution of the magnetic helicity during the
electroweak phase transition (EWPT) in the early Universe is studied.
It is shown that the boundary surface between symmetric (hypermagnetic)
phase and Maxwellian phase with a broken symmetry is a membrana for
the separation of the magnetic helicity. The hypermagnetic helicity
converts into the magnetic one during EWPT and can be a supply of
galactic magnetic helicity. During short EWPT time the helicity
parameter \alpha plays no role: the bubble expansion of new broken phase
is more important. However, before EWPT the bigger the value
of a lepton (right electron) asymmetry \mu_{eR} the bigger helicity parameter
\alpha\sim \mu_{eR}/T and the effect of hypermagnetic helicity growth.
The Higgs as a harbinger of flavor symmetry
Flavour of Grand Unifications - what do neutrinos tell us?
Flavour of Grand Unifications - what do neutrinos tell us?
New aspects of symmetry breaking in Grand Unified Theories
concept of minimality itself can be associated to the simplicity of the relevant Higgs sector. I will review some recent results on the Higgs sector of both ordinary and supersymmetric GUTs, focusing first on a class of minimal nonsupersymmetric SO(10) models, fallen into disuse about 30 years ago and now revived by the quantum level analysis, and then on the investigation of the minimal SM-compatible flipped SO(10) and E(6) supersymmetric Higgs models
Dark Matter candidate from the compactification on a Real Projective Plane
.
.
Discussion of MINOS Results
Discussion on GLOBES
If the Higgs mass is .. or what might be known by 2016
have already been presented. After a short overview about these first LHC results, the perspectives for direct Higgs searches using a realistic(?) LHC road map up to early 2016 will be presented.
Assuming a few representative Higgs masses, implications for its discovery and the consequences for todays experimental constraints and the electroweak precision data will be discussed.
Neutrino mass hierarchy from core-collapse supernovae
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See also the IFIC - CSIC/UVEG seminar list
See also the IFIC - CSIC/UVEG seminar list