M.Sc. (Physics) 1991, UNLP
Ph. D. 1995, UNLP, "Rapid variability of southern extragalactic radio sources"

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My research interests cover a wide range of topics that can be encompassed by the general subject of Relativistic Astrophysics. My initial work, starting with my Ph.D. research, was on radio variability of blazars. Since then, my interest on AGN physics diversified to include optical observations, theory of accretion disks, gamma-ray production mechanisms, dynamics of binary supermassive black hole systems, and cosmic ray acceleration in active galaxies. With S.A. Cellone and J.A. Combi, I got involved in optical microvariability observations of blazars and in the corresponding analysis of the error sources in these kind of studies. I have supervised several students working on these topics. 

As a parallel research line I have implemented a series of studies of extended, nonthermal radio sources of presumed galactic nature. These studies  focused on the search for new supernova remnants of low surface brightness and rest on powerful techniques of imaging processing and background filtering. These same techniques have been applied, with interesting results, to the study of the radio fields around unidentified gamma-ray sources detected by EGRET. The quest for the identification of gamma-ray sources has been a constant among my research interests in the last years. I have carried out many investigations of individual sources, with interesting results, as well as population studies. Recently, this line of research has conducted me into the fascinating realm of extreme stellar properties and I am now engaged in the pursuit of observational signatures of relativistic electrons in massive stars; an interesting field where both ends of the electromagnetic spectrum, radio and gamma photons, are important diagnostic tools. Currently, most of my efforts are devoted to the study of high-energy emission from microquasars and galactic black holes. I also supervised several students researching on this field.

From a purely theoretical point of view, I have devoted significant efforts to gravitational microlensing research. This has been both quasi-conventional, i.e. involving superluminal microlensing in active galaxies, and highly speculative, reaching gravitational lensing by wormhole-like objects. Regarding wormholes, I have explored some almost philosophical questions raised by the possibility of closed timelike curves. 

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