* Keywords:* particle physics, string theory

I obtained my Master's degree at Utrecht University (Netherlands) in 1984, Ph.D. from Rutgers University (NJ, U.S.A.) in 1988, was post-doctoral researcher at Universite Libre de Bruxelles (Belgium) and at Indiana University (IN, U.S.A.) before moving to the University of the Algarve in 1992.

My Ph.D. research was in the area of string theory, on the canonical
structure of string field theory. String theory is an attempt to unify
all matter and interactions, including gravity, in a single theory. It
has as the main characteristic that it assumes particles are
one-dimensional objects (strings), rather than points, with a
characteristic length scale of the order of the Planck length
(~10^{-33} cm). In the context of string field theory his recent
research has been in the area of possible experimentally observable
"stringy" signals. One intriguing example here would be the
possibility that Lorentz and CPT invariance (guaranteed in "ordinary" particle
theories, but not in string theory) not be exact symmetries of
nature.

Recently there has been a renewed interest within the string community in string field theory, following the discoveries that D-branes are contained in string field theory in the form of nonperturbative solutions of the equations of motion. I am working on finding these and related solutions of the string field equations of motions and determining their physical properties.

I am also working on the observable effects of a possible breaking of CPT and/or Lorentz symmetry in Nature, for instance in particle physics experiments, astrophysics or cosmology.

Homepage of the Physics Department