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Erratum (astro-ph/0510172): Robust Limits on Lorentz Violation from Gamma-Ray Bursts
John Ellis, N. E. Mavromatos, D. V. Nanopoulos +2
We correct the fitting formula used in refs. [1,2] to obtain a robust limit on a violation of Lorentz invariance that depends linearly on the photon energy. The correction leads to…
Probing quantum gravity using photons from a flare of the active galactic nucleus Markarian 501 observed by the MAGIC telescope
J. Albert et al., John Ellis, N. E. Mavromatos +3
We analyze the timing of photons observed by the MAGIC telescope during a flare of the active galactic nucleus Mkn 501 for a possible correlation with energy, as suggested by some…
Confronting Dark Energy Models with Astrophysical Data: Non-Equilibrium vs. Conventional Cosmologies
J. R. Ellis, N. E. Mavromatos, V. A. Mitsou +1
We discuss fits of cosmological dark energy models to the available data on high-redshift supernovae. We consider a conventional model with Cold Dark Matter and a cosmological cons…
UHECR Particle Spectra from Crypton Decays
John Ellis, V. E. Mayes, D. V. Nanopoulos
We calculate the spectra of ultra-high-energy cosmic rays (UHECRs) in an explicit top-down model based on the decays of metastable neutral `crypton' states in a flipped SU(5) strin…
Robust Limits on Lorentz Violation from Gamma-Ray Bursts
John Ellis, Nick E. Mavromatos, Dimitri V. Nanopoulos +2
We constrain the possibility of a non-trivial refractive index in free space corresponding to an energy-dependent velocity of light: c(E) \simeq c_0 (1 - E/M), where M is a mass sc…
Beyond the Standard Model of Cosmology
John Ellis, D. V. Nanopoulos
Recent cosmological observations of unprecented accuracy, by WMAP in particular, have established a `Standard Model' of cosmology, just as LEP established the Standard Model of par…