Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2007-06-12
Physics
High Energy Physics
High Energy Physics - Theory
14 pages, Revtex4,two figures.Add explanation for the boundary conditions in section II-A,Section II-B is modified.References
Scientific paper
To understand the mechanism of the fermion pair and fermion-antifermion pair condensation,the solutions of Bethe-Salpeter equation in QED$_{3}$ is examined.In the ladder appoximation our solution for the axial-scalar is consistent with Ward-Takahashi-identity for the axial vector currents.Since the massless scalar-vector sector is described by a coupled integral equation,it is difficult to solve explicitly.We approximate the equation for large and small momentum region separately and convert them into differential equations in position space.These equation can be solved easily.Boundary condition at the origin leads the eigenvalue for dimensionless coupling constant $\lambda=e^{2}/m$.There exists solutions for massless scalar-vector fermion-antifermion (fa) system with discrete spectrum. In our approximation massless-scalar-vector ff systemes does not seem to exist.
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