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Ultra-High Energy Cosmic Rays and Symmetries of Spacetime
O. Bertolami
High energy cosmic rays allow probing phenomena that are inacessible to accelerators. Observation of cosmic rays, presumebly protons, with energies beyond , th…
Fitting BOOMERANG and MAXIMA-1 data with a Einstein-Yang-Mills Cosmological Model
M. C. Bento, O. Bertolami, P. T. Silva
We analyse the implications of recent Cosmic Microwave Background (CMB) data for a specific cosmological model, based on the higher-dimensional Einstein-Yang-Mills System compactif…
Self-interacting Dark Matter and Invisibly Decaying Higgs
M. C. Bento, O. Bertolami, R. Rosenfeld +1
Self-interacting dark matter has been suggested in order to overcome the difficulties of the Cold Dark Matter model on galactic scales. We argue that a scalar gauge singlet coupled…
On the spontaneous breaking of Lorentz invariance
O. Bertolami
We show that estimates of the Lorentz symmetry violation extracted from ultra-high energy cosmic rays beyond the GZK cut-off set bounds on the parameters of a Lorentz-violating ext…