56,694 research outputs found
Models of Supersymmetry for Dark Matter
A brief review of supersymmetric models and their candidates for dark matter
is carried out. The neutralino is a WIMP candidate in the MSSM where -parity
is conserved, but this model has the problem. There are natural solutions
to this problem that necessarily introduce new structure beyond the MSSM,
including new candidates for dark matter. In particular, in an extension of the
NMSSM, the right-handed sneutrino can be used for this job. In -parity
violating models such as the SSM, the gravitino can be the dark matter,
and could be detected by its decay products in gamma-ray experiments.Comment: Proceedings of RICAP 2016, 6 pages, 1 figur
Theoretical Predictions for the Direct Detection of Supersymmetric Dark Matter
We compute the neutralino-nucleon cross section in several supersymmetric
scenarios, taking into account all kind of experimental and astrophysical
constraints. In addition, the constraints that the absence of dangerous charge
and colour breaking minima imposes on the parameter space are also considered.
This computation is relevant for the theoretical analysis of the direct
detection of dark matter in current experiments. We discuss interesting
supergravity and superstring scenarios.Comment: 13 pages, 7 figures, Proceedings of the International Workshop on
Astroparticle and High Energy Physics, AHEP-200
Field-effect transistor improves electrometer amplifier
An electrometer amplifier uses a field effect transistor to measure currents of low amperage. The circuit, developed as an ac amplifier, is used with an external filter which limits bandwidth to achieve optimum noise performance
The SSM and gravitino dark matter
We consider the phenomenological implications of gravitino dark matter in the
context of the SSM. The latter is an R-parity breaking model which
provides a solution to the -problem of the MSSM and explains the origin of
neutrino masses by simply using right-handed neutrino superfields. In
particular, we analyze the prospects for detecting gamma rays from decaying
gravitinos. Gravitino masses larger than 20 GeV are disfavored by the isotropic
diffuse photon background measurements, but a gravitino with a mass range
between GeV gives rise to a signal that might easily be observed by
the FERMI satellite. Through this kind of analysis important regions of the
parameter space of the SSM can be checked.Comment: Proceedings of DSU09 "The Dark Side of the Universe", 1-5 June 2009,
Melbourne, 7 pages, 2 figure
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