Divergence Cancellation and Loop Corrections in String Field Theory on a Plane Wave Background
Abstract
We investigate the one-loop energy shift E to certain two-impurity string states in light-cone string field theory on a plane wave background. We find that there exist logarithmic divergences in the sums over intermediate mode numbers which cancel between the cubic Hamiltonian and quartic ``contact term''. Analyzing the impurity non-conserving channel we find that the non-perturbative, order g_2^2 sqrt(lambda') contribution to E/mu predicted in hep-th/0211220 is in fact an artifact of these logarithmic divergences and vanishes with them, leaving an order g_2^2 lambda' contribution. Exploiting the supersymmetry algebra, we present a form for the energy shift which appears to be manifestly convergent and free of non-perturbative terms. We use this form to argue that E/mu receives order g_2^2 lambda' contributions at every order in intermediate state impurities.
Cite
@article{arxiv.hep-th/0508126,
title = {Divergence Cancellation and Loop Corrections in String Field Theory on a Plane Wave Background},
author = {Gianluca Grignani and Marta Orselli and Bojan Ramadanovic and Gordon W. Semenoff and Donovan Young},
journal= {arXiv preprint arXiv:hep-th/0508126},
year = {2009}
}
Comments
27 pages; added references, acknowledgments, missing normalization in equations 2.3 - 2.8, also cleaned up notation, and added a few footnotes