933 research outputs found
SUSY breaking based on Abelian gaugino kinetic term mixings
We present a SUSY breaking scenario based on Abelian gaugino kinetic term
mixings between hidden and observable sectors. If an extra U(1) gaugino in the
observable sector obtains a large mass through this mixing effect based on SUSY
breaking in the hidden sector, soft SUSY breaking parameters in the MSSM may be
affected by radiative effects due to this gaugino mass. New phenomenological
aspects are discussed in such a SUSY breaking scenario.Comment: latex, 12pages, 2figures, published versio
Inflation in a modified radiative seesaw model
The existence of the inflationary era in the early Universe seems to be
strongly supported by recent CMB observations. However, only a few realistic
inflation scenarios which have close relation to particle physics seem to have
been known unfortunately. The radiative neutrino mass model with inert doublet
dark matter is a promising model for the present experimental issues which
cannot be explained within the standard model. In order to make the model
include inflation, we extend it by a complex scalar field with a specific
potential. This scalar could be closely related to the neutrino mass generation
at a TeV scale as well as inflation. We show that the inflation favored by the
CMB observations could be realized even if inflaton takes sub-Planck values
during inflation.Comment: 20 pages, 3 figure
Neutrino masses and terms in a supersymmetric extra U(1) model
We propose a supersymmetric extra U(1) model, which can generate small
neutrino masses and necessary terms, simultaneously. Fields including
quarks and leptons are embedded in three s of in a different
way among generations. The model has an extra U(1) gauge symmetry at TeV
regions, which has discriminating features from other models studied
previously. Since a neutrino mass matrix induced in the model has a constrained
texture with limited parameters, it can give a prediction. If we impose
neutrino oscillation data to fix those parameters, a value of
can be determined. We also discuss several phenomenological features which are
discriminated from the ones of the MSSM.Comment: 27 pages, 2 figures, final version for publicatio
Enhancement of the annihilation of dark matter in a radiative seesaw model
The radiative seesaw model with an inert doublet has been shown to be
attractive from a viewpoint of both neutrino masses and cold dark matter.
However, if we apply this model to the explanation of the positron excess in
the cosmic ray observed by PAMELA, a huge boost factor is required although it
can be automatically explained that no anti-proton excess has been observed
there. We consider an extension of the model to enhance the thermally averaged
annihilation cross section without changing the features of the model favored
by both the neutrino oscillation and the relic abundance of dark matter. It is
shown that the data of PAMELA and Fermi-LAT can be well explained in this
extended model. Constraints from gamma ray observations are also discussed.Comment: 28 pages, 5 figures, final version for publicatio
-term as the origin of baryon and lepton number asymmetry
We study a possibility of combining an origin of the -term and the
baryon and lepton number asymmetry. If we assume that the -term is
generated through a flat direction of a singlet scalar field, the coherent
oscillation of this condensate around its potential minimum can store the
global U(1) charge asymmetry. The decay of this condensate can distribute this
asymmetry into the lepton and baryon number asymmetry as far as its decay
occurs at an appropriate temperature. We examine the compatibility between this
scenario and the small neutrino mass generation based on both the ordinary
seesaw mechanism and the bilinear R-parity violating terms.Comment: 22 pages, published versio
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