Experimentation:

-Design and construction of particle detectors.
-Pierre Auger: Installation, commissioning and operation of the muon detector BATATA.
-JEM-EUSO (Extreme Universe Space Observatory):
a) Design and construction of the housekeeping system of the experiment 
b)Study, selection, characterization and integration of thermal, high voltage, mechanical and optical sensors of the detector.
c) Design and construction of an opto-mechanical shower simulator for focal surface characterization
d) Verification of the end-to-end detector simulation software

Phenomenology:
Data analysis for the Pierre Auger Observatory:
-Primary cosmic ray flux chemical composition 
-Cosmic ray anisotropy in the arrival directions and its possible correlation with astrophysical sources.

JEM-EUSO:
-Numerical simulation of possible astrophysical scenarios for UHECR production and the analysis of the corresponding scientific potential of the JEM-EUSO mission.
-Neutrino and gamma extensive air shower simulation and the design of discrimination algorithms.
-Numerical module design for cloud treatment by the JEM-EUSO data reconstruction software.

Theory:
-Astroparticle production, acceleration and propagation mechanisms, as well as neutrino and photon associated backgrounds. Different environments and scenarios are considered
-Active Galactic Nuclei (relativistic jets and supermassive blackholes)
-OShock waves in different astrophysical environments: accretion in galaxy clusters, galactic terminal winds, galaxy collisions
-Gamma ray burts
-Dark matter decay in the vicinity of black holes in models with extra-dimensions
-Dark matter decay in galaxy halos

-Study and simulation of the effects of cosmic magnetic fields on UHECR propagation and data analysis.

Medina Tanco GA, Krone-Martins AGO. The Galactic center as a point source of neutrons at EeV energies. Nucl. Phys. B-Proc. Sup. 2007; 165: 280-286.

De Souza V, Medina Tanco G, Ortíz JA. On the fluctuations of the fluorescence photon yield of electrons in extensive air showers for different atmospheric conditions. Astropart. Phys. 2006; 25 (1): 84-92.

De Souza V, Medina Tanco G, Ortíz JA, Sánchez F. Shower size parameter as an estimator of extensive air shower energy in fluorescence telescopes. Phys. Rev. D 2006; 73 (4):043001.

Karl-Heinz Kampert. The Pierre Auger Observatory - status and prospects. Nucl. Phys. B-Proc. Sup. 2006; 151 (1): 393-400.

Medina MC, Gómez Berisso M, Allekotte I, Etchegoyen A, Medina Tanco G, Supanitsky AD. Enhancing the Pierre Auger Observatory to the 1017 to 1018.5 eV range: Capabilities of an Infill Surface Array. Nucl. Instrum. Meth. A 2006; 566 (2): 302-311.

De Souza V, Medina Tanco G, Ortíz JA. Acceptance of fluorescence detectors and its implication in energy spectrum inference at the highest energies. Phys. Rev. D 2005; 72 (10): 103009.

Ortíz JA, Medina Tanco G, De Souza V. Longitudinal development of extensive air showers: Hybrid code SENECA and full Monte Carlo. Astropart. Phys. 2005; 23 (5): 463-473.