12,751 research outputs found
Inflation in Supersymmetric SU(5)
We analyze the adjoint field inflation in supersymmetric (SUSY) SU(5) model.
In minimal SUSY SU(5) hybrid inflation monopoles are produced at the end of
inflation. We therefore explore the non-minimal model of inflation based on
SUSY SU(5), like shifted hybrid, which provides a natural solution for the
monopole problem. We find that the supergravity corrections with non-minimal
Kahler potential are crucial to realize the central value of the scalar
spectral index n_s ~ 0.96 consistent with the seven year WMAP data. The tensor
to scalar ratio r is quite small, taking on values r < 10^{-5}. Due to
R-symmetry massless SU(3) octet and SU(2) triplet Higgs bosons are present and
could spoil for gauge coupling unification. To keep gauge coupling unification
intact, light vector-like particles are added which are expected to be observed
at LHC.Comment: 16 page
Supersymmetric contributions to B -> D K and the determination of angle \gamma
We analyze supersymmetric contributions to B^- -> D^0 K^- and B^- ->\bar{D}^0
K^- processes. We investigate the possibility that supersymmetric CP violating
phases can affect our determination for the angle \gamma in the unitary
triangle of Cabibbo-Kobayashi-Maskaw mixing matrix. We calculate the gluino and
chargino contributions to b--> u(\bar{c}s) and b-->c(\bar{u}s) transitions in a
model independent way by using the mass insertion approximation method. We also
revise the D^0 - \bar{D}^0 mixing constraints on the mass insertions between
the first and second generations of the up sector. We emphasize that in case of
negligible D^0 -\bar{D}^0 mixing, one should consider simultaneous
contributions from more than one mass insertion in order to be able to obtain
the CP asymmetries of these processes within their 1\sigma experimental range.
However, with a large D^0-\bar{D}^0 mixing, one finds a significant deviation
between the two asymmetries and it becomes natural to have them of order the
central values of their experimental measurements.Comment: 20 page
Quintessential Kination and Thermal Production of SUSY e-WIMPs
The impact of a kination-dominated phase generated by a quintessential
exponential model on the thermal abundance of Supersymmetric (SUSY) extremely
Weekly Interacting Massive Particles (e-WIMPs) is investigated. For values of
the quintessential energy-density parameter on the eve of nucleosynthesis close
to its upper bound, we find that: (i) the gravitino constraint is totally
evaded for unstable gravitinos; (ii) the thermal abundance of stable gravitinos
is not sufficient to account for the cold dark matter of the universe; (iii)
the thermal abundance of axinos can satisfy the cold dark matter constraint for
values of the initial (``reheating'') temperature well above those required in
the standard cosmology.Comment: To appear in the proceedings of 4th International Workshop On The
Dark Side Of The Universe (DSU 2008) 1-5 Jun 2008, Cairo, Egyp
Solvolysis Rates in Aqueous-Organic Mixed Solvents: Part II - Kinetics of Alkaline Solvolysis of Monochloroacetate Ion in Water-Ethanol Solutions
1012-101
On supersymmetric contributions to the CP asymmetry of the B -> phi K_S
We analyse the CP asymmetry of the B -> phi K_S process in general
supersymmetric models. In the framework of the mass insertion approximation, we
derive model independent limits for the mixing CP asymmetry. We show that
chromomagnetic type of operator may play an important role in accounting for
the deviation of the mixing CP asymmetry between B -> phi K_S and B -> J/psi
K_S processes observed by Belle and BaBar experiments. A possible correlation
between the direct and mixing CP asymmetry is also discussed. Finally, we apply
our result in minimal supergravity model and supersymmetric models with
non-universal soft terms.Comment: 19 pages, 3 figure
Investigation of the Influence of Nuclear Charge on the Internal Bremsstrahlung Accompanying the β-Decay of 45Ca and 141Ce
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