Search Publications

Constraints on Lorentz Invariance Violation using integral/IBIS observations of GRB041219A

Covino, S.; Götz, D.; Laurent, P. +2 more

One of the experimental tests of Lorentz invariance violation is to measure the helicity dependence of the propagation velocity of photons originating in distant cosmological obejcts. Using a recent determination of the distance of the gamma-ray burst GRB 041219A, for which a high degree of polarization is observed in the prompt emission, we are a…

Metastable dark matter mechanisms for INTEGRAL 511 keV γ rays and DAMA/CoGeNT events

Cline, James M.; Chen, Fang; Frey, Andrew R.

We explore dark matter mechanisms that can simultaneously explain the galactic 511 keV gamma rays observed by INTEGRAL/SPI, the DAMA/LIBRA annual modulation, and the excess of low-recoil dark matter candidates observed by CoGeNT. It requires three nearly degenerate states of dark matter in the 4-7 GeV mass range, with splittings, respectively, of …