Volume Effects for Pion Two-Point Functions in Constant Electric and Magnetic Fields
High Energy Physics - Lattice
2009-05-18 v2 High Energy Physics - Phenomenology
Nuclear Theory
Abstract
We compute finite volume effects relevant for lattice QCD simulations using background fields. Focusing on constant electric and magnetic fields on a periodic lattice, we determine volume corrections to pion two-point functions using chiral perturbation theory. Among such corrections are the finite volume shifts to the electric and magnetic polarizabilities, which are numerically shown to be non-negligible. We additionally find that all terms in the single-particle effective action can be renormalized by infrared effects. This includes Born couplings to the pion current and total charge-squared, which can be renormalized due to the nature of gauge invariance on a torus.
Cite
@article{arxiv.0809.1886,
title = {Volume Effects for Pion Two-Point Functions in Constant Electric and Magnetic Fields},
author = {Brian C. Tiburzi},
journal= {arXiv preprint arXiv:0809.1886},
year = {2009}
}
Comments
16 pages, 6 figures, PQ results added, discussion improved