Pair Production and the
Light-Front Vacuum
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Ramin Ghorbani Ghomeshi
Department of Physics Master’s Thesis 2013 RaminGhorbaniGhomeshi
P a ir P ro d u ct io n a n d th e L igh t- F ro n t V a cu u m
UmeåUniversity2013D
ominated by Heisenberg’s uncertainty principle, vac- uum is not quantum mechanically an empty void, i.e.virtual pairs of particles appear and disappear persis- tently. This medium has been treated perturbatively in conventional quantum field theory in the instant form, which has revealed the non-triviality of the vacuum in such a form of relativistic dynamics . . .
. . . From the viewpoint of Dirac’s front form of Hamiltonian dynamics, however, vacuum turns out to be trivial, which means Schwinger pairs are not allowed to pop out of the vacuum even in the presence of an external disturbance . . .
. . . The aim of this thesis is to explore the properties of such a contradictory aspect of quantum vacuum in two different forms of relativistic dynamics and hence to investigate the possibil- ity of finding a way to resolve this ambiguity. This exercise is largely based on the application of field quantization to light- front dynamics . . .
Department of Physics
Umeå University, SE-901 87 Umeå www.physics.umu.se
