Perturbative Approach to Higher Derivative Theories with Fermions

Details Perturbative Approach to Higher Derivative Theories with Fermions Perturbative Approach to Higher Derivative Theories with Fermions

2002-06-10

arxiv.org/abs/hep-th/0206077v2

Phys.Rev. D66 (2002) 085015

Physics

High Energy Physics

High Energy Physics - Theory

Latex, 21 pages, minor modification, ref. added

Scientific paper

10.1103/PhysRevD.66.085015

We extend the perturbative approach developed in an earlier work to deal with Lagrangians which have arbitrary higher order time derivative terms for both bosons and fermions. This approach enables us to find an effective Lagrangian with only first time derivatives order by order in the coupling constant. As in the pure bosonic case, to the first order, the quantized Hamiltonian is bounded from below whenever the potential is. We show in the example of a single complex fermion that higher derivative interactions result in an effective mass and change of vacuum for the low energy modes. The supersymmetric noncommutative Wess-Zumino model is considered as another example. We also comment on the higher derivative terms in Witten's string field theory and the effectiveness of level truncation.

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