96 citations · 232 across the 12 of their papers we have counts for
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astro-ph2005
Lorentz violation as a quantum-gravity signature
Ralf Lehnert
Many theoretical approaches to quantum gravity predict the breakdown of Lorentz symmetry at Planck energies. Kinematical cosmic-ray studies are a sensitive tool in the search for s…
astro-ph2003
Cosmological acceleration, varying couplings, and Lorentz breaking
Orfeu Bertolami, Ralf Lehnert, Robertus Potting +1
Many candidate fundamental theories contain scalar fields that can acquire spacetime-varying expectation values in a cosmological context. Such scalars typically obey Lorentz-viola…
astro-ph2002
Spacetime-varying couplings and Lorentz violation
Alan Kostelecky, Ralf Lehnert, Malcolm Perry
Spacetime-varying coupling constants can be associated with violations of local Lorentz invariance and CPT symmetry. An analytical supergravity cosmology with time-varying fine-str…