Classical paths in systems of fermions

Details Classical paths in systems of fermions Classical paths in systems of fermions

2003-04-08

arxiv.org/abs/hep-th/0304078v1

Phys.Rev. D67 (2003) 105016

Physics

High Energy Physics

High Energy Physics - Theory

to appear in Pys. Rev. D

Scientific paper

10.1103/PhysRevD.67.105016

We implement in systems of fermions the formalism of pseudoclassical paths that we recently developed for systems of bosons and show that quantum states of fermionic fields can be described, in the Heisenberg picture, as linear combinations of randomly distributed paths that do not interfere between themselves and obey classical Dirac equations. Every physical observable is assigned a time-dependent value on each path in a way that respects the anticommutative algebra between quantum operators and we observe that these values on paths do not necessarily satisfy the usual algebraic relations between classical observables. We use these pseudoclassical paths to define the dynamics of quantum fluctuations in systems of fermions and show that, as we found for systems of bosons, the dynamics of fluctuations of a wide class of observables that we call "collective" observables can be approximately described in terms of classical stochastic concepts. Finally, we apply this formalism to describe the dynamics of local fluctuations of globally conserved fermion numbers.

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