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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… (More)

OVERVIEW The field of High Energy and Astroparticle Physics aims at unraveling the laws of physics at the shortest distance scales and how these give rise to the universe we live in. Up to the highest energies that can presently be created by man-made accelerators , nature is remarkably well described by a single theory, the standard model of particle… (More)

Gamma-ray bursts (GRBs) are expected to provide a source of ultra high energy cosmic rays, accompanied with potentially detectable neutrinos at neutrino telescopes. Recently, IceCube has set an upper bound on this neutrino flux well below theoretical expectation. We investigate whether this mismatch between expectation and observation can be due to neutrino… (More)

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