My research focuses on compact objects and cosmic rays. My earlier research includes gravitation and cosmology; particularly, scalar-tensor theories and non-minimal couplings, primordial nucleosynthesis, scalar dark matter, boson stars, gravitational lensing, non-extensive statistics, and wormholes. I published several papers on all these topics. Part of my work along my career was done as a member of large collaborations building and operating high-energy astrophysics instruments both in space and in the ground.