 02346 GonzalezMestres, L.
 Deformed Lorentz Symmetry and HighEnergy Astrophysics (II)
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Aug 9, 02

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Abstract. Lorentz symmetry violation (LSV) can be generated at the Planck scale, or at some other fundamental length scale, and naturally preserve Lorentz symmetry
as a lowenergy limit (deformed Lorentz symmetry, DLS). DLS can have important implications for ultrahigh energy cosmicray physics (see papers from arXiv.org physics/0003080  hereafter referred to as I  , astroph/0011181 and astroph/0011182, and references quoted in these papers). A crucial question is how DLS can be extended to a deformed Poincaré symmetry (DPS), and what can be the dynamical origin of this phenomenon. We discuss recent proposals to identify DPS with a symmetry incorporating the Planck scale (doubly special relativity, DSR) and suggest new ways in this direction. Implications for models of quadratically deformed relativistic kinematics (QDRK) and linearly deformed relativistic kinematics (LDRK) are also discussed.
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