# Vector profile and gauge invariant observables of string field theory solutions for constant magnetic field background

Journal of High Energy Physics, May 2018

Abstract We study profiles and gauge invariant observables of classical solutions corresponding to a constant magnetic field on a torus in open string field theory. We numerically find that the profile is not discontinuous on the torus, although the solution describes topologically nontrivial configurations in the context of low energy effective theory. From the gauge invariant observables, we show that the solution provide correct couplings of closed strings to a D-brane with constant magnetic field.

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Nobuyuki Ishibashi, Isao Kishimoto, Toru Masuda, Tomohiko Takahashi. Vector profile and gauge invariant observables of string field theory solutions for constant magnetic field background, Journal of High Energy Physics, 2018, 144, DOI: 10.1007/JHEP05(2018)144