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BPS Limit of Multi- D- and DF-strings in Boundary String Field Theory

Gyungchoon Go·Akira Ishida·Yoonbai Kim
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Abstract

A BPS limit is systematically derived for straight multi- D- and DF-strings from the D3D3bar system in the context of boundary superstring field theory. The BPS limit is obtained in the limit of thin D(F)-strings, where the Bogomolnyi equation supports singular static multi-D(F)-string solutions. For the BPS multi-string configurations with arbitrary separations, BPS sum rule is fulfilled under a Gaussian type tachyon potential and reproduces exactly the descent relation. For the DF-strings ((p,q)-strings), the distribution of fundamental string charge density coincides with its energy density and the Hamiltonian density takes the BPS formula of square-root form.

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Gyungchoon Go, Akira Ishida, Yoonbai Kim. 2007-06-13. BPS Limit of Multi- D- and DF-strings in Boundary String Field Theory. https://doi.org/10.1016/j.physletb.2007.06.044

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