Abstract
This is the first of a series of three papers on open string field theories based on Witten star product deformed with a gauge invariant open/closed coupling. This de- formation is a tree-level tadpole which destabilizes the initial perturbative vacuum. We discuss the existence of vacuum-shift solutions which cancel the tadpole and represent a new configuration where the initial D-brane system has adapted to the change in the closed string background. As an example we consider the bulk deformation which changes the compactification radius and, to first order in the deformation, we reproduce the shift in the mass of the open string KK modes from the new kinetic operator after the vacuum shift. We also discuss the possibility of taming closed string degenerations with the open string propagator in the simplest amplitude corresponding to two closed strings off a disk.
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Maccaferri, C., Vošmera, J. Closed string deformations in open string field theory. Part I. Bosonic string. J. High Energ. Phys. 2021, 47 (2021). https://doi.org/10.1007/JHEP09(2021)047
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DOI: https://doi.org/10.1007/JHEP09(2021)047