109 research outputs found
Galactic positrons and electrons from astrophysical sources and dark matter
A very interesting puzzle about the origin of electron and positron cosmic
rays is deduced from the latests experimental results. We model the propagation
of such cosmic rays in terms of a successfully tested two--zone propagation
model. Several theoretical uncertainties -- like ones related to propagation --
are considered to study different types of electron and positron sources: dark
matter annihilation, secondary production, and supernova remnants.Comment: 3 pages, 1 figure. Proceedings for conference "Topics in
Astroparticle and Underground Physics" (TAUP2009). Rome, July 1-5, 200
Planck-scale effects on WIMP dark matter
There exists a widely known conjecture that gravitational effects violate
global symmetries. We study the effect of global-symmetry violating
higher-dimension operators induced by Planck-scale physics on the properties of
WIMP dark matter. Using an effective description, we show that the lifetime of
the WIMP dark matter candidate can satisfy cosmological bounds under reasonable
assumptions regarding the strength of the dimension-five operators. On the
other hand, the indirect WIMP dark matter detection signal is significantly
enhanced due to new decay channels.Comment: 12 pages, 4 figures. Version accepted for publication in Frontier
Photon spectra from quark generation by WIMPs
In this work we provide the fitting formula valid for the simulated photon
spectra from WIMP annihilation into light quark-anti quark (qq-) channels in a
wide range of WIMP masses. We illustrate our results for the cc- channel.Comment: To appear in the AIP proceedings of "Quark Confinement and Hadron
Spectrum IX" (QCHSIX), Madrid 30th August-3rd September 2010. 3 pages, 6
figure
- …