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astro-ph.HE2009★ 61 cited
Probing a Possible Vacuum Refractive Index with Gamma-Ray Telescopes
John Ellis, N. E. Mavromatos, D. V. Nanopoulos
We have used a stringy model of quantum space-time foam to suggest that the vacuum may exhibit a non-trivial refractive index depending linearly on gamma-ray energy: eta -1 ~ E_gam…
astro-ph.HE2009★ 114 cited
Optical spectroscopy and photometry of SAX J1808.4-3658 in outburst
P. Elebert, M. T. Reynolds, P. J. Callanan +8
We present phase resolved optical spectroscopy and photometry of V4580 Sagittarii, the optical counterpart to the accretion powered millisecond pulsar SAX J1808.4-3658, obtained du…