Keywords: quantum field theory and string theory path integrals worldline formalism

The main research topics deal with quantum field theory and string
theory. Quantum field theory gives the main tools needed to
describe the fundamental interactions, summarized in the standard
model of elementary particles. The only known force which does not
have a satisfactory description with quantum fields is the force of
gravity. A model which offers possible solution to the quantum
gravity problem is given by string theory, a theory which describes
the elementary quanta of the fields as one-dimensional objects, the
strings, rather than pointlike particles. In this context much
research has been devoted to the development of the worldline
formalism, a tool to describe quantum field theory in curved spaces
using methods similar to those employed in string theory. Also, new
methods for describing higher spin fields (fields with spin bigger
than two) have been developed with the aim of searching for
alternative theories of unifications and study new phases of string
theory.