1,212 research outputs found
Cold Dark Matter and Neutralinos
Neutralinos are natural candidates for cold dark matter in many realizations
of supersymmetry. We briefly review our recent results in the evaluation of
neutralino relic abundance and direct detection rates in a class of
supergravity models.Comment: 4 pages, 4 figures, uses espcrc2.sty. Proc. of "Sources and detection
of dark matter and dark energy in the Universe (DM2002)". The version on the
archive has low-resolution figures. The paper with high-resolution figures
can be found at
http://www.to.infn.it/~fornengo/proceedings/marinadelrey02.ps.gz or through
http://www.to.infn.it/astropart
Upper bounds on signals due to WIMP self--annihilation: comments on the case of the synchrotron radiation from the galactic center and the WMAP haze
Two recent papers reconsider the possibility that the excess of microwave
emission from a region within of the galactic center (the {\it WMAP
haze}), measured by WMAP, can be due to the synchrotron emission originated by
neutralino self-annihilation; on the basis of this possible occurrence, also
upper bounds on the neutralino self-annihilation cross--section are suggested.
In the present note, we show that in the common case of thermal WIMPs in a
standard cosmological model, when the rescaling of the galactic WIMP density is
duly taken into account for subdominant WIMPs, the upper bound applicable
generically to {\it any} signal due to self-conjugate WIMPs is more stringent
than the ones obtained from analysis of the WMAP haze. We also argue that an
experimental upper bound, which can compete with our generic upper limit, can
rather be derived from measurements of cosmic antiproton fluxes, for some
values of the parameters of the astrophysical propagation model. Finally, we
comment on the possible impact of our generic upper bound on the interpretation
of the WMAP haze in terms of thermal neutralinos in a standard cosmological
scheme.Comment: 3 pages, comments and 1 figure adde
Embedding the 125 GeV Higgs boson measured at the LHC in an effective MSSM: possible implications for neutralino dark matter
We analyze the phenomenological consequences of assuming that the 125 GeV
boson measured at the LHC coincides with one of the two CP-even Higgs bosons of
an effective Minimal Supersymmetric extension of the Standard Model at the
electroweak scale. We consider the two ensuing scenarios and discuss critically
the role of the various experimental data (mainly obtained at colliders and at
B-factories) which provide actual or potential constraints to supersymmetric
properties. Within these scenarios, properties of neutralinos as dark matter
particles are analyzed from the point of view of their cosmological abundance
and rates for direct and indirect detections.Comment: 14 pages, 14 figures, typeset with ReVTeX4. A version of the paper
with full resolution figures can be found at
http://www.to.infn.it/~scopel/embedding.pd
Implications for relic neutralinos of the theoretical uncertainties in the neutralino-nucleon cross-section
We discuss the effect induced on the neutralino-nucleon cross-section by the
present uncertainties in the values of the quark masses and of the quark scalar
densities in the nucleon. We examine the implications of this aspect on the
determination of the neutralino cosmological properties, as derived from
measurements of WIMP direct detection. We show that, within current theoretical
uncertainties, the DAMA annual modulation data are compatible with a neutralino
as a major dark matter component, to an extent which is even larger than the
one previously derived. We also comment on implications of the mentioned
uncertainties for experiments of indirect dark matter detection.Comment: 23 pages, 7 figures, 1 table, typeset with ReVTeX. Due to size
limitations, the version on the archive has low resolution figures. A full
version of the paper can be found at
http://www.to.infn.it/~fornengo/papers/dama_sets.ps.g
Relic neutralinos and the two dark matter candidate events of the CDMS II experiment
The CDMS Collaboration has presented its results for the final exposure of
the CDMS II experiment and reports that two candidate events for dark matter
would survive after application of the various discrimination and subtraction
procedures inherent in their analysis. We show that a population of relic
neutralinos, which was already proved to fit the DAMA/LIBRA data on the annual
modulation effect, could naturally explain the two candidate CDMS II events, if
these are actually due to a dark matter signal.Comment: 3 pages, 3 figure
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