Oscillations of Mossbauer neutrinos
Mossbauer neutrinos can oscillate. After giving quantum mechanical arguments to support this statement, we will compute the oscillation probability of Mossbauer neutrinos, including localization and decoherence terms, in a
quantum mechanical wave packet model. We will then proceed to the calculation of the combined rate of Mossbauer neutrino emission, propagation and absorption in the framework of quantum field theory. This approach allows us to avoid making any a priori assumptions on the neutrino wave function, and it can easily describe the various effects that broaden the neutrino emission and absorption lines. Finally, we will also address the unrealistic, but theoretically extremely interesting, case of Mossbauer neutrinos affected only by natural line broadening and not by solid state effects.
Non-standard neutrino interactions --- future bounds and models
Sneutrino LSPs in R-parity violating mSUGRA Models and feasibility study at the LHC
particle (LSP) in a large region of mSUGRA parameter space. We consider the constraints from neutrino masses, the muon anomalous magnetic moment, "b -> s \gamma" and other precision measurements. We then give examples for
characteristic signatures at hadron colliders. Furthermore, we present the prospects for probing this scenario from the decay of lighter top squark at the LHC.
Growth of cosmological magnetic fields
Multiwavelength constraints on e+e- excess from Dark Matter annihilations
Bimaximal Neutrino Mixing and Weak Complementarity with S4 Discrete Symmetry
a situation where Bimaximal mixing is valid in first approximation and it is
then corrected by terms of order of the Cabibbo angle, arising from the
diagonalization of the charged lepton masses, we construct a model based on
the discrete group S4 where these properties are naturally realized. The model
is supersymmetric in 4-dimensions and the complete flavour group is S4 x Z4 x
U(1)_FN, which also allows to reproduce the hierarchy of the charged lepton
spectrum. The only fine tuning needed in the model is to reproduce the small
observed value of r, the ratio between the neutrino mass squared differences.
Once the relevant parameters are set to accommodate r then the spectrum of
light neutrinos shows a moderate normal hierarchy and is compatible, within
large ambiguities, with the constraints from leptogenesis as an explanation of
the baryon asymmetry in the Universe.
Magnetic field in early galaxies
How to determine the SUSY CP phases?
Tri-bi-maximal mixing and the seesaw mechanism: Strong Hierarchy or Quasi-Degeneracy?
In this talk I discuss two possibilities that can explain the disparity between quark and lepton mixing:
In Sequential Dominance, strongly hierarchical right-handed neutrinos strongly affect the neutrino mixing angles through the see-saw mechanism, leading characteristically to a strong hierarchy of the effective neutrino masses.
SO(10) vs flavor symmetries:possible strategies to describe fermion mixings and mass hierarchies
trying to build an SO(10) GUT model combined with a Flavour
Symmetry (FS) are discussed. Two possible realizations SO(10) x FS
are then presented, based on two different FSs, A4 and Delta27
respectively. The two models realize at leading order tri-bi
maximal mixing in the lepton sector and correctly reproduce the
CKM and all the fermion mass hierarchies.
Non-standard neutrino interactions from low-scale seesaw models
Exclusion of black hole disaster scenarios at the LHC
will start to operate in an energy region which has
never been reached by a man made machine.
This outstanding scientific effort is accompanied
by great fears in the public that possibly produced
mini black holes might destroy the earth.
In this talk the scientific background for the conjectured
mini black holes will be explained and
it will be shown why there is no reason for such fears whatsoever.
Intermediate mass scales in the non-supersymmetric SO(10) grand unification: a reappraisal
Type-III Seesaw with 2HDM
Constraints on Dark Matter large annihilation cross-section from the early Universe
Cosmic-ray signatures of dark matter decay
Cosmological Signatures of the Interacting Dark-Energy with Massive Neutrinos
quintessence scalar field is the
origin of the late time accelerated expansion of the universe. We
present cosmological perturbation
theory in neutrinos probe interacting dark-energy models, and
calculate cosmic microwave background
anisotropies and matter power spectrum. In these models, the evolution
of the mass of
neutrinos is determined by the quintessence scalar field, which is
responsible for the cosmic acceleration
today. We consider several types of scalar field potentials and put
constraints on the coupling
parameter between neutrinos and dark energy. Assuming the flatness of
the universe, the constraint
we can derive from the current observation is Pm < 0.87eV at the 95 % confidence level for the sum over three species of neutrinos. We also discuss on the stability issue of the our model and on the impact of the scattering term in Boltzmann equation from the mass-varying neutrinos.
Quark-lepton complementarity in a PS x S4 scenario
Prospects for observing CP violating Higgs at Tevatron and LHC
for the light flavor jets. We explicitly considered all possible Standard Model backgrounds. We found that it is very hard to observe this signature in the LEP-allowed region of parameter space, even though the backgrounds are
manageable, due to the small signal efficiency at Tevatron. By applying judiciously kinematical selections, we suppressed huge backgrounds and left with a few ten signal events at LHC. Requiring $m_{h_2} \lsim 140$ GeV leads the total background comparable to signal. Moreover, the Higgs signal at LHC might be show up in the vicinity of present LEP exclusion.
Collider and Flavor Phenomenology in the Scalar sector of Warped Extra Dimensions
phenomenology of the two (presumably) lightest scalars in the context of
warped extra dimensions: the Higgs and the radion. This last one, could
be the lightest "new physics" state to be discovered at the LHC in this
type of models. Its phenomenology is very similar to the Standard Model
(SM) Higgs. When SM fields are allowed to live in the bulk of the extra
dimension, new interesting effects appear in the scalar sector of the
model. In particular, both the Higgs and the radion can now typically
mediate Flavor Changing Neutral Currents at tree level. These will
impose bounds on the flavor structure of the model, but also allow for
interesting probes in current and future collider experiments.
Neutrino experiments and nonstandard interactions
neutrino mass pattern observed in recent experiments. Most of these
models imply nonstandard interactions that can be parametrized in
terms of effective four-fermion operators in the low-energy limit. In
this talk I will show the status of some of the constraints to these
parameters obtained from different neutrino experiments data. I will
also discuss the perspectives of some experimental proposals to
improve these bounds.
Sneutrino dark matter in the NMSSM
sneutrino and its
viability as a WIMP dark matter candidate in
the Next-to-MSSM with an extra singlet superfield, included in order
to provide non-vanishing neutrino masses. I
will explain the conditions under which the
right-handed sneutrino has the correct relic abundance and the
dominant annihilation channels. The theoretical
predictions for the sneutrino-proton elastic scattering cross section
will be preesnted
and compared it with present and future experimental sensitivities.
I will show how sneutrinos with a mass in the range of 5-200 GeV can
reproduce the observed dark matter relic density without being
excluded by direct dark matter searches and for natural values of the
input parameters. Interestingly, the predicted scattering cross
section is generally within the reach of future experiments.
Neutrino oscillations in matter with varying density
Discrete symmetries and neutrinos
Leptogenesis in an A4 model
Universe is generated through the leptogenesis mechanism in a specific A4 model where the neutrino masses
are generated by a combination of the type-I and type-II seesaw mechanisms. One of the key ingredients of this model is therefore the existence of a Higgs boson triplet. The Boltzmann set of equations was numerically solved and we found a large region of parameter space where we can achieve the observed baryon asymmetry, while at the same time satisfying the present neutrino data (work in progress.)
Indirect detection of dark matter
Inflation in Supergravity
Minimal Supersymmetric Inverse Seesaw
Cosmic rays positrons and electron from supernova remnants and dark matter annihilation
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See also the IFIC - CSIC/UVEG seminar list
See also the IFIC - CSIC/UVEG seminar list