17,282 research outputs found
Which fraction of the measured cosmic-ray antiprotons might be due to neutralino annihilation in the galactic halo?
We analyze the data of low-energy cosmic-ray antiproton spectrum, recently
published by the BESS Collaboration, in terms of newly calculated fluxes for
secondary antiprotons and for a possible contribution of an exotic signal due
to neutralino annihilation in the galactic halo. We single out the relevant
supersymmetric configurations and discuss their explorability with experiments
of direct search for particle dark matter and at accelerators. We discuss how
future measurements with the Alpha Magnetic Spectrometer (AMS) on the Shuttle
flight may disentangle the possible neutralino-induced contribution from the
secondary one.Comment: 25 pages, ReVTeX, 18 figures (high resolution figures available upon
request
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
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
Sphinx: A Secure Architecture Based on Binary Code Diversification and Execution Obfuscation
Sphinx, a hardware-software co-design architecture for binary code and
runtime obfuscation. The Sphinx architecture uses binary code diversification
and self-reconfigurable processing elements to maintain application
functionality while obfuscating the binary code and architecture states to
attackers. This approach dramatically reduces an attacker's ability to exploit
information gained from one deployment to attack another deployment. Our
results show that the Sphinx is able to decouple the program's execution time,
power and memory and I/O activities from its functionality. It is also
practical in the sense that the system (both software and hardware) overheads
are minimal.Comment: Boston Area Architecture 2018 Workshop (BARC18
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