Séminaire à deux voix : M. Cirelli et Y. Hatta
M. Cirelli/ Y. Hatta
Tue, Nov. 07th 2006, 11:00
Salle Claude Itzykson, Bât. 774, Orme des Merisiers
M. Cirelli (SPhT) Picturing Dark Matter form its Neutrinos. Dark Matter constitutes about one fourth of the contents of the Universe, yet we know almost anything on its nature. A way to (hopefully soon) detect Dark Matter, albeit indirectly, is to collect at the Neutrino Telescopes (huge Cerenkov experiments located under- water or under-ice) the fluxes of high energy neutrinos that should be produced by the annihilations of DM particles accumulated in the center of the Earth and the Sun. The neutrino fluxes carry precious information on the main properties of DM (its abundance, its mass and its annihilation branching ratios), opening windows on its nature and on the theory that explains it. I present the work with which we computed precisely the expected yield of neutrinos of all flavors and, especially, the neutrino spectra, which are more free from astrophysical uncertainties. We developed the appropriate formalism to follow the neutrino production, the evolution of the fluxes in the matter of the Earth and the Sun and in the vacuum and finally several kinds of detection signatures. Based on: hep-ph/0506298, Nucl.Phys.B727,99-138(2005) --------------------------------------------------------------------------- Y. Hatta (SPhT) Small-x physics in QCD and the color glass condensate. I review recent developments in the theory of high energy scattering in QCD. After explaining the violation of unitarity in the standard perturbative calculation, I discuss the semiclassical approach to the problem of unitarity restoration based on the idea of gluon saturation.


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