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## Noncommutative Geometry and Particle Physics |

Abstract: Transverse gauge invariance is the
minimal condition necessary for a theory of spin 2 in flat space to lower
the number of independent polarizations, from five for a massive field,
down to two for a massless one. It will be pointed out that there is
another theory, besides the one given by the Fierz-Pauli
Lagrangian,
that unitarily propagates only spin 2, in flat
space. The nonlinear version of it is
Abstract: We discuss the emergence of the
generalized Wilson loop space in the quantum field-theoretical description of
the high-energy hadron collisions. We show, in particular, how the geometrical
properties of the loop space can be used in the study of the most general
properties of the nonperturbative parton
distribution functions inside the nucleon. [Back] |