4,091 research outputs found
Prospects for Detecting Neutrino Signals from Annihilating/Decaying Dark Matter to Account for the PAMELA and ATIC results
Recent PAMELA data show that positron fraction has an excess above several
GeV while anti-proton one is not. Moreover ATIC data indicates that
electron/positron flux have a bump from 300 GeV to 800 GeV. Both annihilating
dark matter (DM) with large boost factor and decaying DM with the life around can account for the PAMELA and ATIC observations if their main final
products are charged leptons (, and ). In this work, we
calculated the neutrino flux arising from and which originate from
annihilating/decaying DM, and estimated the final muon rate in the neutrino
telescopes, namely Antares and IceCube. Given the excellent angular resolution,
Antares and IceCube are promising to discover the neutrino signals from
Galactic center and/or large DM subhalo in annihilating DM scenario, but very
challenging in decaying DM scenario.Comment: 21 pages, 7 figures, 2 tables. V2: references added. V3: the number
density of massive subhalo has been discussed in the appendix; accepted by
PR
Recognition of nonmanual markers in American Sign Language (ASL) using non-parametric adaptive 2D-3D face tracking
This paper addresses the problem of automatically recognizing linguistically significant nonmanual expressions in American Sign Language from video. We develop a fully automatic system that is able to track facial expressions and head movements, and detect and recognize facial events continuously from video. The main contributions of the proposed framework are the following: (1) We have built a stochastic and adaptive ensemble of face trackers to address factors resulting in lost face track; (2) We combine 2D and 3D deformable face models to warp input frames, thus correcting for any variation in facial appearance resulting from changes in 3D head pose; (3) We use a combination of geometric features and texture features extracted from a canonical frontal representation. The proposed new framework makes it possible to detect grammatically significant nonmanual expressions from continuous signing and to differentiate successfully among linguistically significant expressions that involve subtle differences in appearance. We present results that are based on the use of a dataset containing 330 sentences from videos that were collected and linguistically annotated at Boston University
Nucleon Mass Splitting at Finite Isospin Chemical Potential
We investigate nucleon mass splitting at finite isospin chemical potential in
the frame of two flavor Nambu--Jona-Lasinio model. It is analytically proved
that, in the phase with explicit isospin symmetry breaking the proton mass
decreases and the neutron mass increases linearly in the isospin chemical
potential.Comment: 3 pages and no figure
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